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Sustainable Management of the Amazon Rainforest

The Amazon rainforest is located in the north of South America, spanning an area of around 8 million km2 including parts of Brazil, Columbia, Peru, Venezuela, Ecuador Bolivia, Suriname, Guyana and French Guyana.

In some areas of the Amazon rainforest, sustainable management strategies are in place to ensure people today can get the resources they need in a way that ensures future generations can also benefit from the ecosystem .

Sustainable management strategies are affected by political and economic factors .

Governance 

Governance relates to control of rainforests and who has a say in how rainforests are used. In some areas, rainforests are protected by national and international laws.

In Brazil, the largest protected area of rainforest is the Central Amazon Conservation Complex (CACC) . The CACC covers 60000 km2 as is classified as a World Heritage Site by the United Nations, which means it is protected by international treaties. Limits are placed on hunting , logging and fishing and access is limited.

Central Amazon Conservation Complex (CACC)

In other areas local communities, with the help of NGOs, are involved in rainforest governance. In Columbia, an organisation known as Natütama is working with the local community in Puerto Nariño to protect river species such as the Amazon River dolphin. Local people are employed to teach members of the community on how to protect habitats and endangered river species. Local fishermen collect information about the number and distribution of species and report illegal hunting.

Commodity Value

Commodity value means assigning a value to different good and services in a rainforest. Sustainable management ensures rainforests are worth. more than the value of the timber and other resources that can be extracted, such as gold. An example of this is sustainable foresty, which balances the removal of trees to sell with the conservation of the forest.

Selective logging involves only removing a small number of trees, allowing the forest to regenerate naturally. This saves money in the long run as logging companies do not need to replace felled trees.

Sustainable logging companies such as Precious Woods Amazon place limits on the number of trees being cut down so the rainforest can recover. They also use a range of species so that none are over-exploited.

International agreements try to reduce illegal logging and ensure timber comes from sustainable sources. The Forestry Stewardship Council allows the use of its logo by companies that operate in a sustainable way so consumers know they are buying sustainable timber.

FSC certified wood

Ecotourism is a type of tourism that minimises damage to the environment and benefits local people.

An example of an ecotourism project is the Yachana Lodge in Equador. It is located in a remote area of the Amazon Rainforest where local people rely on subsistence farming.

Yachana Lodge

The project employs local people. This provides a reliable source of income and a better quality of life. The project encourages local people to use the rainforest in a sustainable way so tourists continue to visit.

Volunteers work with local Amazon youth who study at the Yachana Technical High School where learning is focused on five main areas:

• Rainforest conservation
• Sustainable agriculture
• Renewable energy
• Animal husbandry
• Micro-enterprise development .

Tourists are only allowed to visit in small groups, minimising their impact on the environment. Tourists take part in activities that help raise awareness of conservation issues.

Entrance fees are paid by the tourists which are invested in conservation and education projects.

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Tropical rainforest case study

Case study of a tropical rainforest setting to illustrate and analyse key themes in water and carbon cycles and their relationship to environmental change and human activity.

Amazon Forest The Amazon is the largest tropical rainforest on Earth. It sits within the Amazon River basin, covers some 40% of the South American continent and as you can see on the map below includes parts of eight South American countries: Brazil, Bolivia, Peru, Ecuador, Colombia, Venezuela, Guyana, and Suriname. The actual word “Amazon” comes from river. Amazing Amazon facts; • It is home to 1000 species of bird and 60,000 species of plants • 10 million species of insects live in the Amazon • It is home to 20 million people, who use the wood, cut down trees for farms and for cattle. • It covers 2.1 million square miles of land • The Amazon is home to almost 20% of species on Earth • The UK and Ireland would fit into the Amazon 17 times! The Amazon caught the public’s attention in the 1980s when a series of shocking news reports said that an area of rainforest the size of Belgium was being cut down and subsequently burnt every year. This deforestation has continued to the present day according to the Sao Paulo Space Research Centre. Current statistics suggest that we have lost 20% of Amazon rainforest. Their satellite data is also showing increased deforestation in parts of the Amazon.

Water The water cycle is very active within the Amazon rainforest and it interlinks the lithosphere, atmosphere and biosphere.  The basin is drained by the Amazon River and its tributaries.  The average discharge of water into the Atlantic Ocean by the Amazon is approximately 175,000 m 3 per second, or between 1/5th and 1/6th of the total discharge into the oceans of all of the world's rivers. 3 The Rio Negro, a tributary of the Amazon, is the second largest river in the world in terms of water flow, and is 100 meters deep and 14 kilometers wide near its mouth at Manaus, Brazil. Rainfall across the Amazon is very high.  Average rainfall across the whole Amazon basin is approximately 2300 mm annually. In some areas of the northwest portion of the Amazon basin, yearly rainfall can exceed 6000 mm. 3 Only around 1/3 of the rain that falls in the Amazon basin is discharged into the Atlantic Ocean. It is thought that; 1. Up to half of the rainfall in some areas may never reach the ground, being intercepted by the forest and re-evaporated into the atmosphere. 2. Additional evaporation occurs from ground and river surfaces, or is released into the atmosphere by transpiration from plant leaves (in which plants release water from their leaves during photosynthesis) 3. This moisture contributes to the formation of rain clouds, which release the water back onto the rainforest. In the Amazon, 50-80 percent of moisture remains in the ecosystem’s water cycle. 4

This means that much of the rainfall re-enters the water cycling system of the Amazon, and a given molecule of water may be "re-cycled" many times between the time that it leaves the surface of the Atlantic Ocean and is carried by the prevailing westerly winds into the Amazon basin, to the time that it is carried back to the ocean by the Amazon River. 4 It is thought that the water cycle of the Amazon has global effects.  The moisture created by rainforests travels around the world. Moisture created in the Amazon ends up falling as rain as far away as Texas, and forests in Southeast Asia influence rain patterns in south eastern Europe and China. 4 When forests are cut down, less moisture goes into the atmosphere and rainfall declines, sometimes leading to drought. These have been made worse by deforestation. 4 Change to the water and carbon cycles in the Amazon The main change to the Amazon rainforest is deforestation.  Deforestation in the Amazon is generally the result of land clearances for; 1. Agriculture (to grow crops like Soya or Palm oil) or for pasture land for cattle grazing 2. Logging – This involves cutting down trees for sale as timber or pulp.  The timber is used to build homes, furniture, etc. and the pulp is used to make paper and paper products.  Logging can be either selective or clear cutting. Selective logging is selective because loggers choose only wood that is highly valued, such as mahogany. Clear-cutting is not selective.  Loggers are interested in all types of wood and therefore cut all of the trees down, thus clearing the forest, hence the name- clear-cutting. 3. Road building – trees are also clear for roads.  Roads are an essential way for the Brazilian government to allow development of the Amazon rainforest.  However, unless they are paved many of the roads are unusable during the wettest periods of the year.  The Trans Amazonian Highway has already opened up large parts of the forest and now a new road is going to be paved, the BR163 is a road that runs 1700km from Cuiaba to Santarem. The government planned to tarmac it making it a superhighway. This would make the untouched forest along the route more accessible and under threat from development. 4. Mineral extraction – forests are also cleared to make way for huge mines. The Brazilian part of the Amazon has mines that extract iron, manganese, nickel, tin, bauxite, beryllium, copper, lead, tungsten, zinc and gold! 5. Energy developmen t – This has focussed mainly on using Hydro Electric Power, and there are 150 new dams planned for the Amazon alone.  The dams create electricity as water is passed through huge pipes within them, where it turns a turbine which helps to generate the electricity.  The power in the Amazon is often used for mining.  Dams displace many people and the reservoirs they create flood large area of land, which would previously have been forest.  They also alter the hydrological cycle and trap huge quantities of sediment behind them. The huge Belo Monte dam started operating in April 2016 and will generate over 11,000 Mw of power.  A new scheme the 8,000-megawatt São Luiz do Tapajós dam has been held up because of the concerns over the impacts on the local Munduruku people. 6. Settlement & population growth – populations are growing within the Amazon forest and along with them settlements.  Many people are migrating to the forest looking for work associated with the natural wealth of this environment. Settlements like Parauapebas, an iron ore mining town, have grown rapidly, destroying forest and replacing it with a swath of shanty towns. The population has grown from 154,000 in 2010 to 220,000 in 2012. The Brazilian Amazon’s population grew by a massive 23% between 2000 and 2010, 11% above the national average.

The WWF estimates that 27 per cent, more than a quarter, of the Amazon biome will be without trees by 2030 if the current rate of deforestation continues. They also state that Forest losses in the Amazon biome averaged 1.4 million hectares per year between 2001 and 2012, resulting in a total loss of 17.7 million hectares, mostly in Brazil, Peru and Bolivia.  12

The impacts of deforestation Atmospheric impacts Deforestation causes important changes in the energy and water balance of the Amazon. Pasturelands and croplands (e.g. soya beans and corn) have a higher albedo and decreased water demand, evapotranspiration and canopy interception compared with the forests they replace. 9 Lathuillière et al. 10 found that forests in the state of Mato Grosso; • Contributed about 50 km 3 per year of evapotranspiration to the atmosphere in the year 2000. • Deforestation reduced that forest flux rate by approximately 1 km 3 per year throughout the decade. • As a result, by 2009, forests were contributing about 40 km 3 per year of evapotranspiration in Mato Grosso.

Differences such as these can affect atmospheric circulation and rainfall in proportion to the scale of deforestation The agriculture that replaces forest cover also decreases precipitation. In Rondônia, Brazil, one of the most heavily deforested areas of Brazil, daily rainfall data suggest that deforestation since the 1970s has caused an 18-day delay in the onset of the rainy season. 11 SSE Amazon also has many wild fires, which are closely associated with deforestation, forest fragmentation and drought intensity. According to Coe et al (2015) “ the increased atmospheric aerosol loads produced by fires have been shown to decrease droplet size, increase cloud height and cloud lifetime and inhibit rainfall, particularly in the dry season in the SSE Amazon. Thus, fires and drought may create a positive feedback in the SSE Amazon such that drought is more severe with continued deforestation and climate change .” 9

The impacts of climate change on the Amazon According to the WWF: • Some Amazon species capable of moving fast enough will attempt to find a more suitable environment. Many other species will either be unable to move or will have nowhere to go. • Higher temperatures will impact temperature-dependent species like fish, causing their distribution to change. • Reduced rainfall and increased temperatures may also reduce suitable habitat during dry, warm months and potentially lead to an increase in invasive, exotic species, which then can out-compete native species. • Less rainfall during the dry months could seriously affect many Amazon rivers and other freshwater systems. • The impact of reduced rainfall is a change in nutrient input into streams and rivers, which can greatly affect aquatic organisms. • A more variable climate and more extreme events will also likely mean that Amazon fish populations will more often experience hot temperatures and potentially lethal environmental conditions. • Flooding associated with sea-level rise will have substantial impacts on lowland areas such as the Amazon River delta. The rate of sea-level rise over the last 100 years has been 1.0-2.5 mm per year, and this rate could rise to 5 mm per year. • Sea-level rise, increased temperature, changes in rainfall and runoff will likely cause major changes in species habitats such as mangrove ecosystems. 15 Impacts of deforestation on soils Removing trees deprives the forest of portions of its canopy, which blocks the sun’s rays during the day, and holds in heat at night. This disruption leads to more extreme temperature swings that can be harmful to plants and animals. 8 Without protection from sun-blocking tree cover, moist tropical soils quickly dry out. In terms of Carbon, Tropical soils contain a lot of carbon.  The top meter holds 66.9 PgC with around 52% of this carbon pool held in the top 0.3 m of the soil, the layer which is most prone to changes upon land use conversion and deforestation. 14 Deforestation releases much of this carbon through clearance and burning.  For the carbon that remains in the soil, when it rains soil erosion will wash much of the carbon away into rivers after initial deforestation and some will be lost to the atmosphere via decomposition too. 

Impacts of deforestation on Rivers Trees also help continue the water cycle by returning water vapor to the atmosphere. When trees are removed this cycle is severely disrupted and areas can suffer more droughts. There are many consequences of deforestation and climate change for the water cycle in forests; 1. There is increased soil erosion and weathering of rainforest soils as water acts immediately upon them rather than being intercepted. 2. Flash floods are more likely to happen as there is less interception and absorption by the forest cover. 3. Conversely, the interruption of normal water cycling has resulted in more droughts in the forest, increasing the risk of wild fires 4. More soil and silt is being washed into rivers, resulting in changes to waterways and transport 5. Disrupt water supplies to many people in Brazil

References 1 - Malhi, Y. et al. The regional variation of aboveground live biomass in old-growth Amazonian forests. Glob. Chang. Biol. 12, 1107–1138 (2006). 2 - Fernando D.B. Espírito-Santo  et al.  Size and frequency of natural forest disturbances and the Amazon forest carbon balance. Nature Communications volume 5, Article number: 3434 (2014) Accessed 3rd of January 2019 retrieved from https://www.nature.com/articles/ncomms4434#ref4 3 - Project Amazonas. Accessed 3rd of January 2019 retrieved from https://www.projectamazonas.org/amazon-facts  4 - Rhett Butler, 2012. IMPACT OF DEFORESTATION: LOCAL AND NATIONAL CONSEQUENCES.  Accessed 3rd of January 2019 retrieved from https://rainforests.mongabay.com/0902.htm 5 – Mark Kinver. Amazon: 1% of tree species store 50% of region's carbon. 2015. BBC. Accessed 3rd of January 2019 retrieved from https://www.bbc.co.uk/news/science-environment-32497537 6 -     Sophie Fauset et al. Hyperdominance in Amazonian forest carbon cycling. Nature Communications volume 6, Article number: 6857 (2015). Accessed 3rd of January 2019 retrieved from https://www.nature.com/articles/ncomms7857 7- Brienen, R.J.W et al. (2015) Long-term decline of the Amazon carbon sink, Nature, h ttps://www.nature.com/articles/nature14283 8 – National Geographic – Deforestation - Learn about the man-made and natural causes of deforestation–and how it's impacting our planet. Accessed 20th of January 2019 retrieved from https://www.nationalgeographic.com/environment/global-warming/deforestation/

9 -  Michael T. Coe, Toby R. Marthews, Marcos Heil Costa, David R. Galbraith, Nora L. Greenglass, Hewlley M. A. Imbuzeiro, Naomi M. Levine, Yadvinder Malhi, Paul R. Moorcroft, Michel Nobre Muza, Thomas L. Powell, Scott R. Saleska, Luis A. Solorzano, and Jingfeng Wang. (2015) Deforestation and climate feedbacks threaten the ecological integrity of south–southeastern Amazonia. 368, Philosophical Transactions of the Royal Society B: Biological Sciences. Accessed 20th of January 2019 retrieved from http://rstb.royalsocietypublishing.org/content/368/1619/20120155

10 - Lathuillière MJ, Mark S, Johnson MS & Donner SD. (2012). Water use by terrestrial ecosystems: temporal variability in rainforest and agricultural contributions to evapotranspiration in Mato Grosso, Brazil. Environmental research Letters Volume 7 Number 2. http://iopscience.iop.org/article/10.1088/1748-9326/7/2/024024/meta

11- Nathalie Butt, Paula Afonso de Oliveira & Marcos Heil Costa (2011). Evidence that deforestation affects the onset of the rainy season in Rondonia, Brazil JGR Atmospheres, Volume 116, Issue D11. https://doi.org/10.1029/2010JD015174

12 – WWF, Amazon Deforestation. Accessed 20th of January 2019 retrieved from http://wwf.panda.org/our_work/forests/deforestation_fronts/deforestation_in_the_amazon/

13 - Berenguer, E., Ferreira, J., Gardner, T. A., Aragão, L. E. O. C., De Camargo, P. B., Cerri, C. E., Durigan, M., Oliveira, R. C. D., Vieira, I. C. G. and Barlow, J. (2014), A large-scale field assessment of carbon stocks in human-modified tropical forests. Global Change Biology, 20: 3713–3726. https://onlinelibrary.wiley.com/doi/full/10.1111/gcb.12627

14 - N.HBatjes, J.ADijkshoorn, (1999). Carbon and nitrogen stocks in the soils of the Amazon Region. Geoderma, Volume 89, Issues 3–4, Pages 273-286. Accessed 20th of January 2019 retrieved from https://www.sciencedirect.com/science/article/pii/S001670619800086X

15 – WWF, Impacts of climate change in the Amazon. Accessed 20th of January 2019 retrieved from http://wwf.panda.org/knowledge_hub/where_we_work/amazon/amazon_threats/climate_change_amazon/amazon_climate_change_impacts/

Written by Rob Gamesby

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September 7, 2021 | Combined Reports - UConn Communications

Study Shows the Impacts of Deforestation and Forest Burning on Biodiversity in the Amazon

Since 2001, between 40,000 and 73,400 square miles of Amazon rainforest have been impacted by fires

Ring of fire: Smoke rises through the understory of a forest in the Amazon region. Plants and animals in the Amazonian rainforest evolved largely without fire, so they lack the adaptations necessary to cope with it. (Credit: Paulo Brando)

A new study, co-authored by a team of researchers including UConn Ecology and Evolutionary Biology researcher Cory Merow provides the first quantitative assessment of how environmental policies on deforestation, along with forest fires and drought, have impacted the diversity of plants and animals in the Amazon. The findings were published in the Sept. 1 issue of Nature .

Researchers used records of more than 14,500 plant and vertebrate species to create biodiversity maps of the Amazon region. Overlaying the maps with historical and current observations of forest fires and deforestation over the last two decades allowed the team to quantify the cumulative impacts on the region’s species.

They found that since 2001, between 40,000 and 73,400 square miles of Amazon rainforest have been impacted by fires, affecting 95% of all Amazonian species and as many as 85% of species that are listed as threatened in this region. While forest management policies enacted in Brazil during the mid-2000s slowed the rate of habitat destruction, relaxed enforcement of these policies coinciding with a change in government in 2019 has seemingly begun to reverse this trend, the authors write. With fires impacting 1,640 to 4,000 square miles of forest, 2019 stands out as one of the most extreme years for biodiversity impacts since 2009, when regulations limiting deforestation were enforced.

“Perhaps most compelling is the role that public pressure played in curbing forest loss in 2019,” Merow says. “When the Brazilian government stopped enforced forest regulations in 2019, each month between January and August 2019 was the worse month on record (e.g. comparing January 2019 to previous January’s) for forest loss in the 20-year history of available data. However, based on international pressure, forest regulation resumed in September 2019, and forest loss declined significantly for the rest of the year, resulting in 2019 looking like an average year compared to the 20-year history.  This was big: active media coverage and public support for policy changes were effective at curbing biodiversity loss on a very rapid time scale.”

The findings are especially critical in light of the fact that at no point in time did the Amazon get a break from those increasing impacts, which would have allowed for some recovery, says senior study author Brian Enquist, a professor in UArizona’s Department of Ecology and Evolutionary Biology .

“Even with policies in place, which you can think of as a brake slowing the rate of deforestation, it’s like a car that keeps moving forward, just at a slower speed,” Enquist says. “But in 2019, it’s like the foot was let off the brake, causing it to accelerate again.”

Known mostly for its dense rainforests, the Amazon basin supports around 40% of the world’s remaining tropical forests. It is of global importance as a provider of ecosystem services such as scrubbing and storing carbon from the atmosphere, and it plays a vital role in regulating Earth’s climate. The area also is an enormous reservoir of the planet’s biodiversity, providing habitats for one out of every 10 of the planet’s known species. It has been estimated that in the Amazon, 1,000 tree species can populate an area smaller than a half square mile.

“Fire is not a part of the natural cycle in the rainforest,” says study co-author Crystal N. H. McMichael at the University of Amsterdam. “Native species lack the adaptations that would allow them to cope with it, unlike the forest communities in temperate areas. Repeated burning can cause massive changes in species composition and likely devastating consequences for the entire ecosystem.”

Since the 1960s, the Amazon has lost about 20% of its forest cover to deforestation and fires. While fires and deforestation often go hand in hand, that has not always been the case, Enquist says. As climate change brings more frequent and more severe drought conditions to the region, and fire is often used to clear large areas of rainforest for the agricultural industry, deforestation has spillover effects by increasing the chances of wildfires. Forest loss is predicted reach 21 to 40% by 2050, and such habitat loss will have large impacts on the region’s biodiversity, according to the authors.

“Since the majority of fires in the Amazon are intentionally set by people, preventing them is largely within our control,” says study co-author Patrick Roehrdanz, senior manager of climate change and biodiversity at Conservation International. “One way is to recommit to strong antideforestation policies in Brazil, combined with incentives for a forest economy, and replicate them in other Amazonian countries.”

Policies to protect Amazonian biodiversity should include the formal recognition of Indigenous lands, which encompass more than one-third of the Amazon region, the authors write, pointing to previous research showing that lands owned, used or occupied by Indigenous peoples have less species decline, less pollution and better-managed natural resources.

The authors say their study underscores the dangers of continuing lax policy enforcement. As fires encroach on the heart of the Amazon basin, where biodiversity is greatest, their impacts will have more dire effects, even if the rate of forest burning remains unchanged.

The research was made possible by strategic investment funds allocated by the Arizona Institutes for Resilience at UArizona and the university’s Bridging Biodiversity and Conservation Science group. Additional support came from the National Science Foundation’s Harnessing the Data Revolution program . Data and computation were provided through the Botanical Information and Ecology Network , which is supported by CyVerse , the NSF’s data management platform led by UArizona.

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Deforestation, warming flip part of Amazon forest from carbon sink to source

• July 14, 2021
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The study area, which represents about 20 percent of the Amazon basin, has lost 30 percent of its rainforest

New results from a nine-year research project in the eastern Amazon rainforest finds that significant deforestation in eastern and southeastern Brazil has been associated with a long-term decrease in rainfall and increase in temperature during the dry season, turning what was once a forest that absorbed carbon dioxide into a source of planet-warming carbon dioxide emissions.

The study, published in the journal Nature , explored whether these changes had altered how much carbon the Amazon stored in its vast forests. 

“Using nearly 10 years of CO 2   (carbon dioxide ) measurements, we found that the more deforested and climate-stressed eastern Amazon, especially the southeast, was a net emitter of CO 2 to the atmosphere, especially as a result of fires,” said John Miller, a scientist with NOAA’s Global Monitoring Laboratory and a co-author. “On the other hand, the wetter, more intact western and central Amazon, was neither a carbon sink nor source of atmospheric CO 2 , with the absorption by healthy forests balancing the emissions from fires.”   

In addition to storing vast amounts of carbon, Amazonia is also one of the wettest places on Earth, storing immense amounts of water in its soils and vegetation. Transpired by leaves, this moisture evaporates into the atmosphere, where it fuels prodigious rainfall, averaging more than seven feet per year across the basin. For comparison the average annual rainfall in the contiguous U.S. is two and half feet. Several studies have estimated that water cycling through evaporation is responsible for 25 to 35 percent of total rainfall in the basin. 

But deforestation and global warming over the last 40 years have affected rainfall and temperature with potential impacts for the Amazon’s ability to store carbon. Conversion of rainforest to agriculture has caused a 17 percent decrease in forest extent in the Amazon, which stretches over an area almost as large as the continental U.S.. Replacing dense, humid forest canopies with drier pastures and cropland has increased local temperatures and decreased evaporation of water from the rainforest, which deprives downwind locations of rainfall. Regional deforestation and selective logging of adjacent forests further reduces forest cover, amplifying the cycle of drying and warming.  This, in turn, can reduce the capacity of the forests to store carbon,  and increase their vulnerability to fires.

The  2.8 million square miles of jungle in the Amazon basin represents more than half of the tropical rainforest remaining on the planet. The Amazon is estimated to contain about 123 billion tons of carbon above and below ground, and is one of Earth’s most important terrestrial carbon reserves. As global fossil-fuel burning has risen, the Amazon has absorbed CO 2 from the atmosphere, helping to moderate global climate.  But there are indications from this study and previous ones that the Amazon’s capacity to act as a sink may be disappearing.

Over the past several decades, intense scientific interest has focused on the question of whether the combined effects of climate change and the ongoing conversion of jungle to pasture and cropland could cause the Amazon to release more carbon dioxide than it absorbs. 

In 2010, lead author Luciana Gatti, who led the international team of scientists from Brazil, the United Kingdom, New Zealand and the Netherlands, set out to explore this question. During the next nine years, Gatti, a scientist with Brazil’s National Institute for Space Research and colleagues obtained airborne measurements of CO 2  and carbon monoxide concentrations above Brazilian Amazonia. Analysis of CO 2 measurements from over 600 aircraft vertical profiles, extending from the surface to around 2.8 miles above sea level at four sites, revealed that total carbon emissions in eastern Amazonia are greater than those in the west. 

“The regions of southern Pará and northern Mato Grosso states represent a worst-case scenario,” said Gatti. 

The southeast region, which represents about 20 percent of the Amazon basin, and has experienced 30 percent deforestation over the previous 40 years. Scientists recorded a 25 percent reduction in precipitation and a temperature increase of at least 2.7 degrees Fahrenheit during the dry months of August, September and October, when trees are already under seasonal stress. Airborne measurements over nine years revealed this region was a net emitter of carbon, mainly as a result of fires, while areas further west, where less than 20 percent of the forest had been removed, sources balanced sinks. The scientists said the increased emissions were likely due to conversion of forest to cropland by burning, and by reduced uptake of CO 2 by the trees that remained. 

These findings help scientists better understand the long-term impacts of interactions between climate and human disturbances on the carbon balance of the world’s largest tropical forest.

“The big question this research raises is if the connection between climate, deforestation, and carbon that we see in the eastern Amazon could one day be the fate of the central and western Amazon, if they become subject to stronger human impact,” Miller said.  Changes in the capacity of tropical forests to absorb carbon will require downward adjustments of the fossil fuel emissions compatible with limiting global mean temperature increases to less than 2.0 or 1.5 degrees Celsius, he added.

This research was supported by NOAA’s Global Monitoring Laboratory and by funding from the State of Sao Paulo Science Foundation, UK Environmental Research Council, NASA, and the European Research Council. 

For more information, contact Theo Stein, NOAA Communications: [email protected]

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Amazon Case Study: Robusta in the Rainforest

Founded 2014

Annual revenue $38,000 (2020)

Revenue growth  47% (2020)  

Jobs created 40 families benefited

Global market value of coffee At least $200 billion (projected)

Global market value of organic coffee $6.8 billion (2018)

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This article is part of  AQ’ s  special report  on sustainable development of the Amazon.

In a swath of the Amazon that cattle ranching has turned into Brazil’s “new frontier of deforestation,” one company is helping farmers find an alternative in coffee – and regenerating deforested land in the process.

Launched by the Institute of Conservation and Sustainable Development of the Amazon (IDESAM), Café Apuí Agroflorestal (Apuí Agroforestry Coffee) took root in 2012 when IDESAM staff met Maria das Dores, a small-scale farmer. Das Dores and her husband had abandoned an unprofitable plot of coffee bushes. To everyone’s surprise, IDESAM found that the crop was quietly thriving amid the encroaching forest.

Today, the couple is among 40 families cultivating coffee for Café Apuí by intercropping native trees with coffee. The method improves soil fertility and provides shade for coffee bushes, which grew wild in the forest before coffee’s mass commodification centuries ago. The families have seen their coffee’s productivity double using the method, and their incomes have grown at least 300%.

The approach shows it’s possible to “produce in a way that dialogues with the forest,” said Felipe Villela, co-founder of reNature, an NGO helping Café Apuí connect to markets and funding.

Many other farmers in Apuí, a municipality in Amazonas state, have since the 1980s traded coffee farming for cattle ranching, resulting in 1,100 square miles of forest cut down, mostly for pasture. Between 2013 and 2018, deforestation in the municipality was more than double the rate for the entire Brazilian Amazon.

But since 2015, Café Apuí has reforested nearly 100 acres, with a five-year goal to reforest 600 hectares (1,483 acres) farmed by 600 families.

“We want to provide a new, sustainable model for farmers,” said Pedro Soares, a manager at IDESAM.

After a round of investor funding, Café Apuí transitioned into a startup in 2020, with IDESAM owning 51% of its shares. Its certified-organic blends are for sale online, and in 2020 the company made its first shipment to a Dutch producer of Nespresso pods. As the “first coffee sustainably produced in the Amazon,” (according to the company) Café Apuí’s specialty status – and the premium price that entails – is a key plank in its business model.

Annual revenues grew 47% in 2020, but the company hasn’t broken even yet. The logistics of rainforest production entail high costs, which the company and IDESAM work to offset through grants from international funders and the sale of carbon credits.

“There’s a market out there” for Café Apuí, said José Sette, the executive director of the London-based International Coffee Organization. In 2020, Brazil increased its exports of differentiated coffees, which include organic and sustainably grown beans, by 4.4% over 2019, reaching a value of $1.29 billion. “There are challenges involved, but it’s certainly viable.”

Amazon Assessment Report 2021

Executive Summary

Part I | The Amazon as a Regional Entity of the Earth System

• Chapter 1: Geology and geodiversity of the Amazon: Three billion years of history This chapter explores how geodiversity evolved over three billion years of history. It shows that periods of continental breakup followed by mountain building ultimately led to the fundamental physiographic subdivisions of the Amazon, and a wealth of landscapes, soils, ore deposits, oil and gas reserves, and freshwater aquifers. Data on the Amazon’s geodiversity support a central theme of the environmental sciences, that the formation of most natural resources (like rare-earth ores, hydrocarbons, freshwater aquifers, and fertile soils) requires natural processes to operate undisturbed over immense periods of geological time and across broad spatial domains.
• Chapter 2: Evolution of Amazonian biodiversity This chapter reviews the evolutionary history of the Amazon’s terrestrial and riverine ecosystems, involving geological and climatic events operating over millions of years and across the whole of continental South America. The chapter discusses the important roles of geographic barriers, habitat heterogeneity, climate change, and species interactions in generating and maintaining the most biodiverse ecosystems on Earth. This unique history produced heterogeneous environments and diverse habitats at multiple geographic scales, which altered the connections between populations and allowed for the accumulation of the most diverse biota on Earth.
• Chapter 3: Biological diversity and ecological networks in the Amazon This chapter provides an overview of biodiversity in the Amazon, discusses the reasons why this region is so rich in species and ecosystems, and outlines some outstanding ecological processes that make the Amazon an icon of the natural world. Featured terrestrial and aquatic taxonomic groups illustrate how much we know about diversity in the Amazon, and more importantly, how much we still do not know. A clear understanding of biodiversity levels and their spatial and temporal variations is crucial to understanding future stability under different climate change, land use change, forest fragmentation, and deforestation scenarios and informing conservation and restoration efforts.
• Chapter 4: Amazonian ecosystems and their ecological functions This chapter describes the diversity of plants and ecosystems in the lowland Amazon and discusses how complex regional gradients in climate and soil conditions drive regional variability in species composition, vegetation dynamics, carbon stocks, and productivity. The Amazon river network and its role in connecting aquatic and terrestrial ecosystems through organisms and nutrient exchanges is also emphasized.
• Chapter 5: The Physical hydroclimate system of the Amazon This chapter reviews the main features and large- to mesoscale mechanisms that contribute to the Amazon’s climate, its inter-annual and inter-decadal variability, and extreme drought and flood events. It examines the effects of extreme events on vegetation and the partitioning of precipitation into evapotranspiration (ET), runoff, flow seasonality, and floodplain dynamics; and describes the floodplain´s role in the biogeochemical cycle.
• Chapter 6: Biogeochemical Cycles in the Amazon This chapter summarizes the cycles of three key biogeochemical elements, carbon, nitrogen and phosphorus, with a focus on carbon, spanning both terrestrial and aquatic ecosystems in Amazon. The chapter also examines the emissions of two key trace gases which make substantial contributions to radiative warming, methane and dinitrogen oxide, and summarizes trace gas and aerosol emissions from the Amazon and their impact on atmospheric pollution, cloud properties, and water cycling.
• Cross Chapter 1: The Amazon Carbon Budget The main objective of this cross-chapter is to summarize the status of the Amazon as a source or sink of carbon (C). The processes and studies involved are detailed in other SPA chapters. The major challenge of determining the Amazon’s status as a net C source or sink at a continental scale is that many com-plex processes contribute to C fluxes.
• Chapter 7: Biogeophysical Cycles: Water Recycling, Climate Regulation This chapter assesses biogeophysical interactions between the Amazon rainforest and the climate. A historical perspective is presented, highlighting breakthroughs which improved our understanding of the mechanisms by which the rainforest interacts with the atmosphere.
• Chapter 8: Peoples of the Amazon before European Colonization Archaeology tells us how Indigenous peoples transformed nature in the Amazon over the millennia to the point that it is difficult to separate natural from cultural patrimony there today. It also shows that any kind of sustainable future for the region has to consider the rich Indigenous heritage manifested in archaeological sites and contemporary landscapes, and the contemporary knowledge of traditional societies.
• Chapter 9: Peoples of the Amazon and European colonization (16th-18th centuries) This chapter covers the history of the Amazon between the 16 th  and 18 th  centuries, including myths that originated at that time and persist into the present, influencing political and social relations. It also highlights the main actors involved in this process and their narratives. Finally, it shows how the extraction of natural resources has been accompanied by the subjugation and exploitation of the workforce and the development of multiple forms of domination and extermination, especially of Indigenous peoples, since the era of European conquest.
• Chapter 10: Critical interconnections between the cultural and biological diversity of Amazonian peoples and ecosystems This chapter explores the Amazon’s biocultural diversity, focusing on IPLCs’ worldviews, knowledge systems, livelihood strategies, and governance regimes. It synthesizes the main social and political processes that have led to the formal recognition of IPLCs’ lands and/or territories across the Amazon. The chapter highlights IPLCs’ critical role in using, shaping, conserving, and restoring Amazonian ecosystems and biodiversity, despite historic ongoing processes including violence, displacement, and conflicts between conservation and development agendas.
• Chapter 11: Economic drivers in the Amazon from the 19th century to the 1970s This chapter identifies the main economic processes that occurred in the Brazilian, Andean, and Guyanese Amazon from the 19 th  century until the 1970s. Specifically, the chapter describes the history of extractivism and the effects of geopolitical reconfiguration on the Amazon after the process of emancipation or decolonization. It analyzes the extraction of  quina  barks (species of the genus  Chinchona , Rubiaceae) and rubber ( Hevea brasiliensis , Euphorbiacae), as well as the resulting characteristics and practices developed by social actors related to the local and regional economy. It also describes the history and emergence of exploitation of oil and minerals (mainly gold), including the beginning of wildlife trafficking and the emergence of mechanized agriculture, intensive livestock, and mega-infrastructure.
• Chapter 12: Languages of the Amazon: Dimensions of diversity This chapter covers the extraordinary Indigenous linguistic diversity of the Amazon region, including its different dimensions: the existence of a relatively large number of languages in the region; how these languages are related to each other, representing an impressive genealogical diversity; geographical distribution over different Amazonian subregions; the effects of language contact that have resulted in several linguistic areas; different levels of endangerment and the social circumstances that contribute to it; and, finally, what is lost when languages disappear.
• Chapter 13: African Presence in the Amazon: A Glance This chapter provides evidence on the importance of African descendants in the construction of the Amazon and other tropical areas in the Americas, and highlights their importance for long-lasting sustainable development strategies in the region. It looks at both the cultural exchange and socio-historic perspectives, emphasizing land settlement patterns, natural resource use, and management practices. It focuses mostly on Brazil, Suriname, and Colombia, and emphasizes the importance of eliminating the invisibility of African descendant peoples in academic research and policy.

Part II | Social-Ecologi cal Transformations: Changes in the Amazon

• Chapter 14: Amazon in Motion: Changing politics, development strategies, peoples, landscapes, and livelihoods This chapter presents the major ideas, actors, and practices that have shaped the Amazon’s current development and deforestation dynamics. Outlining general periods of macro policy, it traces the evolution of today’s complex interactions among diverse livelihoods, conservation, and production systems, both legal and clandestine. It highlights how Amazonians have continuously adapted to changing circumstances while fighting to advance their own proposals for conservation and equity in development.
• Chapter 15: Complex, diverse, and changing agribusiness and livelihood systems in the Amazon This chapter focuses on recent changes in the structure of systems of production in the Amazon, exploring their implications for the region’s environment and society. It also highlights local responses to these challenges, and opportunities for more sustainable production systems. An in-depth quantitative case study on the Brazilian Amazon is presented.
• Chapter 16: The state of conservation policies, protected areas, and Indigenous territories, from the past to the present Two management classifications are the cornerstone of Amazonian conservation: protected areas and Indigenous territories. This chapter focuses on the historical processes, starting in the 1960s, that led to their creation, as well as the contemporary challenges they face and their importance for conservation.
• Chapter 17: Globalization, extractivism and social exclusion: Threats and opportunities to Amazon governance in Brazil From the 1970s on, the Amazon experienced its deepest transformation, becoming a commodity and energy provider for both domestic and international markets, through extraction of natural resources. Living conditions barely improved, and social conflict and violence became widespread, particularly affecting Indigenous peoples and local communities. Conservation efforts also became globalized and achieved significant results. Brazil’s 84% reduction in deforestation from 2005-2012, based on an integrated strategy with high political priority, provides an important case study that can support future policies across the basin. These gains were reversed in recent years, and unsustainable extractivist policies generally prevailed over conservation and the sustainable use of biodiversity in the whole Amazon basin (Chapter 18).
• Chapter 18: Globalization, extractivism, and social exclusion: Country-specific manifestations This chapter presents country-specific descriptions of human intervention in the Amazon, including the expansion of agricultural and extractive activities. The analysis contains two comprehensive national cases (Colombia and Ecuador) and three short studies focused on public policies (Peru, Bolivia and Venezuela). The Brazilian experience reducing deforestation is presented in Chapter 17.
• Chapter 19: Drivers and ecological impacts of deforestation and forest degradation This chapter discusses the main drivers of deforestation and forest degradation in the Amazon, particularly agricultural expansion, road construction, mining, oil and gas development, forest fires, edge effects, logging, and hunting. It also examines these activities’ impacts and synergies between them.
• Chapter 20: Drivers and impacts of changes in aquatic ecosystems Amazonian aquatic ecosystems are being destroyed and threats to their integrity are projected to grow in number and intensity. Here we present some of the main impacts on aquatic ecosystems triggered by infrastructure projects and predatory and illegal practices.
• Chapter 21: Human well-being and health impacts of the degradation of terrestrial and aquatic ecosystems Amazonian forests and aquatic ecosystems are the basis for several ecosystem services, all of which play a crucial role in people’s livelihoods, human well-being, and health. Some of the most relevant and challenging health problems in the Amazon are associated with deforestation and degradation of terrestrial and aquatic ecosystems, including the risk of contracting infectious diseases, respiratory problems caused by exposure to smoke from deforestation and forest fires, and mercury contamination caused by gold mining. Here we demonstrate that environmental degradation affects the health of millions of Amazonians.
• Chapter 22: Long-term variability, extremes, and changes in temperature and hydro meteorology This chapter describes the observed and projected changes in temperature, river discharge, and precipitation patterns and extremes in the Amazon region, as well as their impacts and possible thresholds. The emphasis is on the effect of climactic extremes on biodiversity and ecological processes.
• Chapter 23: Impacts of deforestation and climate change on biodiversity, ecological processes, and environmental adaptation This chapter presents observed and predicted impacts of climate change on Amazonian ecosystems, focusing on biodiversity, ecosystem services, carbon cycling, fisheries, and emissions from biomass burning. It also considers climate and land-use change feedbacks and highlights knowledge gaps to better understand these complex interactions.
• Chapter 24: Resilience of the Amazon forest to global changes: Assessing the risk of tipping points This chapter reviews and discusses existing evidence of ongoing changes in the Amazon forest system that may lead to resilience loss and the potential to cross tipping points in which the ecosystem may shift either gradually or abruptly to a persistent, environmentally degraded configuration.

Part III | The Solution Space: Finding Sustainable Pathways for the Amazon

• Chapter 25: A Pan-Amazonian sustainable development vision Developing a clear vision is the central starting point for any action plan. This chapter reviews the main visions regarding the Amazon and proposes a Living Amazon Vision based on a set of values, principles, and knowledge systems described throughout the chapter.
• Chapter 26: Sustainable Development Goals (SDGs) and the Amazon This chapter discusses the importance and limitations of the five SDG dimensions (People, Planet, Prosperity, Peace and Partnership) in the Amazonian context. It also discusses the performance and trends of Amazonian countries in achieving the SDGs.
• Chapter 27: Conservation measures to counter the main threats to Amazonian biodiversity Human activities destroy biodiversity and disrupt the functioning of aquatic and terrestrial ecosystems at different levels. This chapter provides sustainable approaches to address some of the biggest threats to the Amazon’s biodiversity and ecosystems, i.e., deforestation, damming of rivers, mining, hunting, illegal trade, drug, production and trafficking, illegal logging, overfishing, and infrastructure expansion. The role of restoration is addressed in chapters 28 and 29.
• Chapter 28: Restoration options for the Amazon This chapter examines site-specific opportunities and approaches to restore terrestrial and aquatic systems, focusing on the local actions and benefits. Landscape and biome-wide considerations are addressed in Chapter 29.
• Chapter 29: Restoration priorities and benefits within landscapes and catchments and across the Amazon Basin Restoration can be applied in many different Amazonian contexts, but will be most effective at leveraging environmental and social benefits when it is prioritized across the Amazon basin, landscapes, and catchments. Here we outline the considerations that are most relevant for planning and scaling restoration across the Amazon.
• Chapter 30: Opportunities and challenges for a healthy standing forest and flowing rivers bioeconomy in the Amazon This chapter highlights the paradox between the Amazon’s extraordinary socio-biodiversity and its distance from the scientific, technological, and market frontier of the contemporary bioeconomy. It discusses the current socioeconomic structures available in the region, as well as challenges and pathways for a transition to a socially-fair and sustainable bioeconomy.
• Chapter 31: Strengthening land and natural resource governance and management: Protected areas, Indigenous lands, and local communities’ territories Protected areas, Indigenous lands, and local communities’ territories play a critical role in holding back deforestation, maintaining regional and global climate stability, and – above all – protecting land rights. Nevertheless, these lands are currently threatened by political and economic interests that drive land speculation, agribusiness expansion, and illegal logging and mining, resulting in increasing deforestation rates. Governments are also reassessing and walking back territorial rights legislation.
• Cross Chapter 2: Legacy from the Ancestors: Amazonian Biocultural Landscapes and Global Sustainability in a Post-COVID-19 World Here, we provide three examples of Indigenous-led projects promoting sustainable development of Amazonian biocultural landscapes: the Amazon Sacred Headwaters initiative in Ecuador-Peru; the Ally Guayusa Cooperative in Ecuador; and the Amazon Hopes Collective in the Upper Xingu in Brazil.
• Chapter 32: Milestones and challenges in the construction and expansion of participatory intercultural education in the Amazon This chapter aims to give visibility to participatory intercultural education experiences across the Amazon region. It starts with an examination of the issues with the general educational system, and then presents case studies which offer different paths forward. These case studies reflect not only the importance of participatory education for IPLCs, but also how knowledge is itself a form of communication and political influence that helps IPLCs guarantee their rights.
• Chapter 33: Connecting and sharing diverse knowledges to support sustainable pathways in the Amazon This chapter highlights the under-recognized importance of ILK to conservation and sustainable development efforts across the Amazon, utilizing the conceptual framework of public participation in scientific research. It reviews a range of illustrative examples which articulate ILK and mainstream scientific and technical knowledges in conservation and development initiatives. We also consider recent policy recommendations and guidelines by professional associations and civil society organizations.
• Chapter 34: Boosting relations between the Amazon forest and its globalizing cities By providing a brief and non-authoritative analysis of the physical and cultural relations between rural (forest) and urban areas in the Amazon, we identify several points for improvement, such as economic incentives to encourage healthcare professionals to serve the countryside, implementing peri-urban agricultural belts to improve urban food security, increasing access to urban green spaces, and investing in innovation around the “smart cities, smart forests” concept. Perhaps most importantly, this would include mobilizing human, financial, and institutional resources to restore cultural, spiritual, and affective bonds between urban and forest inhabitants.

Case Study: The Amazonian Road Decision

The proposed Pucallpa–Cruzeiro do Sul will connect the Amazon’s interior to urban centers and export markets in Peru and Brazil. However, critics are worried that the road will also create new opportunities for illegal logging and infringe on the territory of indigenous communities and wildlife.

Biology, Geography, Human Geography

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On the western edge of the Amazon River, there is a proposal to construct a road. This road would connect the remote town of Cruzeiro do Sul, Brazil, with the larger city of Pucallpa, Peru. The construction of the road has become a subject of contentious debate. Proponents of the road claimed that it would provide an efficient way for rural farmers and tradesmen to get their goods to city markets. They claimed it would also allow loggers to more easily transport timber from the depths of the Amazon rainforest to sawmills. From the sawmills in Pucallpa, goods could be transported to Peru’s Pacific coast and shipped to international buyers. Critics of the Pucallpa-Cruzeiro do Sul road, however, argue that it would cut right through traditional territories of the Ashéninka, an indigenous people of eastern Peru. Many leaders fear the road will increase access to previously undeveloped rainforest, threatening the ecosystem and the Ashéninka way of life. Large trees, such as mahogany, for example, will catch the eye of illegal loggers because of their high market value. The great mahogany trees also serve as protection to the Ashéninka from the outside world and are essential for the health of the Amazonian rainforest. The trees provide shelter, food, and nesting grounds that sustain the vast biodiversity within the ecosystem, an ecosystem the Ashéninka have come to depend on for their own food, shelter, and life sustenance. Geography The Amazon Basin is located in South America, covering an area of seven million square kilometers (2.7 million square miles). Nearly 70 percent of the basin falls within Brazil with remaining areas stretching into parts of Peru, Ecuador, Bolivia, Colombia, Venezuela, and Guyana. The Amazon’s massive drainage basin is made of dozens of smaller watersheds , including the Tamaya. Its watershed lies at the headwaters of the Purus and Juruá Rivers, near the border of Peru and Brazil. The Ashéninka people have lived in this region for centuries, surviving on game, fish, and cultivated crops, such as yucca roots, sweet potato, corn, coffee, and sugar cane. Background The rainforest surrounding the Amazon is the largest on the entire planet. In addition to 33 million human inhabitants, including 385 distinct Indigenous groups, it hosts the greatest diversity of plant and animal life in the world. More than two million species of insects are native to the region, including many tree-living species and hundreds of spiders and butterflies. Primates are abundant—including howler, spider, and capuchin monkeys—along with sloths, snakes, and iguanas. Brightly colored parrots, toucans, and parakeets are just some of the region’s native birds. Many of these species are unique to the Amazon rainforest, which means they cannot be found anywhere else in the world. At a global level, the Amazon rainforest helps to regulate climate and acts as a carbon sink for greenhouse gases . At a national level, the Amazon is considered a source of energy and income, based on production and commercialization of raw materials. Some of the most valued tree species in the world thrive in the rainforest. Mahogany is one of the most valuable resources from the Amazon forest. The tree’s rich, red grain and durability make it one of the most coveted building materials in the world. A single mahogany tree can fetch thousands of U.S. dollars on the international market. Even though logging is prohibited in much of the Amazon River, it is legal in some areas in large part because the sale of the wood is so lucrative. The high demand for mahogany has left many of Peru’s watersheds—such as the Tamaya—stripped of their most valuable trees. Without large trees, and their roots, the watershed risks heavy flooding and soil erosion. Conflict The Pucallpa-Cruzeiro do Sul road is part of a larger development plan to link South America’s remote, isolated economies through new transportation, energy, and telecommunications projects. Tension exists between communities that favor developing the rural economies of the Amazon Basin and those who favor preserving its forested areas and diversity of life. The Initiative for the Integration of the Regional Infrastructure of South America (IIRSA) is a proposal for the construction of several highways throughout the continent, five of them within the western Amazon Basin. The Pucallpa-Cruzeiro do Sul road is one such proposed highway. Supporters of the Pucallpa-Cruzeiro do Sul road say international demand for Amazonian resources could help develop the rural economies that are scattered throughout the basin. In addition to providing a route of access for rural goods to enter the global market, the road will allow members of rural communities to access better health care, education, and welfare. This could lead to improved living conditions, healthier lifestyles, and longer life spans. Conservationists are concerned that infrastructure such as the Pucallpa-Cruzeiro do Sul road will devastate an already weakened Amazonian ecosystem, as road access is highly correlated with  deforestation . In Brazil, for instance, 80 percent of deforestation occurs within 48.28 kilometers (30 miles) of a road. Critics argue that the construction of a road along the Brazil-Peru corridor will provide easier access for loggers to reach mahogany and other trees. Indigenous communities like the Ashéninka will also be affected. These communities have largely chosen to maintain a traditional way of life, and conservationists are concerned that the Pucallpa-Cruzeiro do Sul road may expose them to disease and land theft. Identification of Stakeholders Indigenous Communities:  Members of the Ashéninka community are trying to protect the forest and their native lands. Yet, like other Indigenous communities in the area, they are in turmoil, largely divided between those favoring conservation and those seeking greater economic opportunities. While the Ashéninka want to preserve their culture and connections to the forest, they also need access to things like clothes, soap, and medicine. The road could establish trade routes that make these goods more accessible. However, isolated peoples could be exposed to disease and land theft. Wildlife:  The proposed Pucallpa-Cruzeiro do Sul road runs through Serra do Divisor National Park, Brazil, and other reserves that are home to threatened and rare species, including mammals, reptiles, and birds. For some of these species, such as the spider monkey and red howler monkey, the construction of the road could make their populations vulnerable to fragmentation and more visible to hunters. As mahogany and other canopy giants are removed, any wildlife that relies on the trees for shelter, nesting, or food will need to relocate. Amazonian Ecosystem:  In addition to the detrimental effects to the flora and fauna in the area, the construction of the Pucallpa-Cruzeiro do Sul road could accelerate erosion, reduce water quality, and increase deforestation for agriculture and timber extraction. Tropical forest accounts for 40 percent of the global terrestrial carbon sink. A reduced number of trees could exacerbate global warming. Fewer forests means larger amounts of greenhouse gases entering the atmosphere. Logging Companies:  If a road is constructed, loggers will have easier access to mahogany and other trees, allowing them to generate more income and provide a higher standard of living for their families and communities. A higher standard of living might include expanded educational opportunities, improved healthcare facilities, and the chance to participate in political debate. Residents of Rural Communities:  The Pucallpa-Cruzeiro do Sul road would allow local farmers and business people to transfer goods from the Amazonian interior to Peru’s Pacific coast. Right now, merchants who want to travel between Cruzeiro do Sul and Pucallpa must do so by plane. A reliable road would improve basic infrastructure, transportation, and communication for greater commercial and social integration between Peru and Brazil, which meets part of the larger objective of the Initiative for the Integration of Regional Infrastructure in South America. International Consumers:  The global demand for mahogany makes it a multimillion dollar business. Mahogany is used to create bedroom sets, cabinets, flooring, and patio decks throughout the world, mostly in the United States and Europe. Conflict Mitigation Groups are seeking to mitigate conflict in the Pucallpa-Cruzeiro do Sul road conflict through dialogue and alternate infrastructure plans. Environmental conservation groups have suggested that the Pucallpa-Cruzeiro do Sul road be removed from the list of approved projects until the community engages in greater communication surrounding two aspects of the project. First, conservationists are seeking more information on the environmental impact of the construction. This discussion involves local environmental groups, government representatives, and businesses. Second, conservationists are seeking full consent to the project from indigenous communities. Some critics of the Pucallpa-Cruzeiro do Sul road argue that roads are not the only option for the Pucallpa business community to extend its commerce. Traditional river systems are already in place. These critics think the fluvial network should be explored as a viable alternative to road construction. The Upper Amazon Conservancy is working with indigenous peoples to help protect their native territories. One initiative involves organizing community “vigilance committees” that consist of members of indigenous peoples who help park services by patrolling the edges of national parks and keeping illegal loggers out.

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Related Resources

Amazon Deforestation and Climate Change

Join Gisele Bundchen when she meets with one of Brazil’s top climate scientists to discuss the complexity of the Amazon rainforest and its connection to Earth’s atmosphere.

Anthropology, Geography

High on a tower overlooking the lush Amazon canopy, Gisele Bundchen and Brazilian climate scientist Antonio Nobre talk about the importance of the rainforest and the impact of cutting down its trees.

As Nobre explains, the rainforest is not only home to an incredible diversity of species, it also has a critical cooling effect on the planet because its trees channel heat high into the atmosphere. In addition, forests absorb and store carbon dioxide (CO 2 ) from the atmosphere—CO 2 that is released back into the atmosphere when trees are cut and burned.

Nobre warns that if deforestation continues at current levels, we are headed for disaster. The Amazon region could become drier and drier, unable to support healthy habitats or croplands.

Find more of this story in the “Fueling the Fire” episode of the National Geographic Channel’s Years of Living Dangerously series.

Transcript (English)

- Growing up in Southern Brazil, my five sisters and I ate meat pretty much every day. It's just part of the culture here. Per capita, Brazilians are one of the top consumers of beef on the planet. Now, with the world's growing appetite for beef, Brazil has also become a major exporter and is aiming to increase its market share, partly by selling to the US, the world's biggest consumer of beef, and to China, where demand for beef has grown 25% in just 10 years. I understand the need to develop and grow, but does that have to come at the expense of the rainforest and the climate? The Amazon Rainforest is about the same size as the continental United States. One-fifth of the world's fresh water runs through it, and it is home to more species of animals and plants than anywhere on Earth. The Amazon represents more than half of the remaining rainforests on the planet. This forest is so vast, but it is not indestructible. To find out what's at stake, I'm going to talk to one of Brazil's top climate scientist, Dr. Antonio Nobre. So Antonio, tell us a little bit about this amazing green carpet of heaven over here.

- Well, most people don't have the opportunity to come from the top of the forest. If you see all this many shades of green as you see here, it's because biodiversity is the essence of this type of forest. Every species of trees has thousands of species of bugs, and also if you get a leaf of one of the species, and you look to the microbes that is sitting on the top of leaf, you find millions of species, millions, and this is all below our radar screen, so to speak, because we don't realize, it's invisible. And the trees are shooting water from the ground, groundwater up high in the sky, and this goes up into the atmosphere and releases the heat out there, and this radiates to space. And this is very important as a mechanism to cool the planet. They're like air conditioners. Open air conditioning, that's what the forest is.

- So in other words, if we lose all these trees, we are losing the air conditioning that cools off the whole planet.

- Not only that.

- Not only that?

- No. The trees are soaking up carbon, you know the pollution that we produce, like carbon dioxide? Yeah, yeah, yeah.

- Burning gasoline in our cars, you release carbon dioxide in the air, or burning coal, and the trees use carbon dioxide as a raw material.

- So the trees are storing all this carbon, so if you come and cut it down and burn it out, does that mean that all that carbon goes up in the air?

- Absolutely. Yeah.

- What would happen if this forest was gone?

- When the forest is destroyed, climate changes, and then forest that's left is damaged as well. And then the forest grows drier and drier and eventually catch fire. So in the extreme, the whole area becomes a desert. And that's what is in store if we deforest. So we have to quit deforestation yesterday, not 2020 or '30. And there is no plan C. You know, you have plan A. Plan A is business as usual. Keep plundering with all the resources and using as if it were infinite. Plan B is what many people are attempting, changing the matrix of energy and using clean sources, stop eating too much meat, and replanting forests If that doesn't work, then we go to plan C. What's plan C? I have no idea.

- Going to another planet.

- But we can't do that.

- We don't have another planet, so either we work with plan B or we're-

- Basically, yeah. We're done, and so plan B has to work. It has to work.

- People have to take accountability, 'cause it can't just be like, I'm leaving over here and whatever happens over there, who cares?

- It's not my problem.

- It's not my problem, because it is everyone's problem.

- Yes. People should wake up. It's like when you're in the midst of an unfolding disaster, what do you do? You panic? No. You move it. Move, move, move, move. That's what we need to do.

Transcripción (Español)

- El año en que vivimos en peligro.

- Cuando era niña en el sur de Brasil, mis cinco hermanas y yo comíamos carne casi todos los días. Es parte de la cultura aquí. Per cápita, los brasileños son uno de los mayores consumidores de carne de res en el planeta. Ahora, con el creciente apetito mundial por la carne de res, Brasil también se ha convertido en un importante exportador y está buscando aumentar su participación en el mercado, en parte vendiendo a los Estados Unidos, el mayor consumidor de carne de res del mundo, y a China, donde la demanda de carne de res ha crecido un 25 % en tan solo 10 años. Entiendo la necesidad de desarrollarse y crecer, pero ¿tiene que ser a expensas de la selva tropical y el clima? La selva amazónica tiene casi el mismo tamaño que los Estados Unidos continentales. Una quinta parte del agua dulce del mundo fluye a través de ella. Y es hogar de más especies de animales y plantas que cualquier otro lugar en la Tierra. El Amazonas representa más de la mitad de las selvas tropicales restantes en el planeta. Estado Mato Grosso, Brasil Esta selva es tan vasta, pero no es indestructible. Para descubrir lo que está en juego, voy a hablar con uno de los principales científicos climáticos de Brasil, el Dr. Antonio Nobre. Antonio, cuéntanos un poco acerca de esta increíble alfombra verde de cielo que tenemos aquí.

- Bueno, la mayoría de las personas no tienen la oportunidad de venir hasta la cima de la selva. Si ves todos los diferentes tonos de verde como estos aquí, es porque la biodiversidad es la esencia de este tipo de selva. Cada especie de árboles tiene miles de especies de insectos, y también si tomas una hoja de una de las especies, y miras a los microbios en la parte superior de la hoja, encuentras millones de especies, millones, y todo esto queda por debajo de nuestro radar, porque no nos damos cuenta, es invisible. Y los árboles están extrayendo agua del subsuelo, hasta lo alto en el cielo, y esto sube a la atmósfera y libera el calor allí, y esto se irradia al espacio. Este es un mecanismo muy importante para enfriar el planeta. Son como aires acondicionados. Aire acondicionado al aire libre, eso es el bosque.

- En otras palabras, si perdemos todos estos árboles, estamos perdiendo el aire acondicionado que enfría todo el planeta.

- No solo eso.

- ¿No solo eso?

- No. Los árboles están absorbiendo carbono, ¿la contaminación que producimos, como el dióxido de carbono?

- Al quemar gasolina en los autos, se libera dióxido de carbono al aire, o quemando carbón, y los árboles usan el dióxido de carbono como materia prima.

- Entonces los árboles están almacenando todo este carbono, así que si lo cortas y lo quemas, ¿eso significa que todo ese carbono sube al aire?

- Absolutamente. Sí.

- ¿Qué pasaría si este bosque desapareciera?

- Cuando el bosque es destruido, el clima cambia, y luego el bosque que queda también se daña. Luego el bosque se vuelve cada vez más seco y eventualmente se incendia. En caso extremo, toda el área se convierte en un desierto. Eso es lo que nos espera si deforestamos. Así que tenemos que dejar de deforestar desde ayer, no en 2020 o 2030. No hay un plan C. Tienes un plan A. El plan A es seguir como siempre. Continuar saqueando todos los recursos y usarlos como si fueran infinitos. El plan B es lo que muchos están intentando, cambiar la matriz de energía y usar fuentes limpias, dejar de comer demasiada carne y reforestar bosques. Si eso no funciona, entonces pasamos al plan C. ¿Cuál es el plan C?

- No tengo idea.

- Ir a otro planeta.

- Pero no podemos hacer eso.

- No tenemos otro planeta, así que o trabajamos con el plan B o estamos-

- Acabados.

- Básicamente, sí. Estamos acabados, así que el plan B tiene que funcionar. Tiene que funcionar.

- Las personas deben asumir responsabilidad, porque no puedes nada más pensar, yo vivo aquí y lo que suceda por allá, ¿a quién le importa?

- A mí qué.

- No es mi problema, porque es un problema de todos.

- Sí. La gente debería despertar. Es como cuando estás en medio de un desastre en desarrollo, ¿qué haces? ¿Entrar en pánico? No. Lo mueves. Que se mueva. Eso es lo que necesitamos hacer.

The Amazon rain forest absorbs one-fourth of the CO2 absorbed by all the land on Earth. The amount absorbed today, however, is 30% less than it was in the 1990s because of deforestation. A major motive for deforestation is cattle ranching. China, the United States, and other countries have created a consumer demand for beef, so clearing land for cattle ranching can be profitable—even if it’s illegal. The demand for pastureland, as well as cropland for food such as soybeans, makes it difficult to protect forest resources.

Many countries are making progress in the effort to stop deforestation. Countries in South America and Southeast Asia, as well as China, have taken steps that have helped reduce greenhouse gas emissions from the destruction of forests by one-fourth over the past 15 years.

Brazil continues to make impressive strides in reducing its impact on climate change. In the past two decades, its CO2 emissions have dropped more than any other country. Destruction of the rain forest in Brazil has decreased from about 19,943 square kilometers (7,700 square miles) per year in the late 1990s to about 5,180 square kilometers (2,000 square miles) per year now. Moving forward, the major challenge will be fighting illegal deforestation.

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Related Resources

Case Study: Deforestation in the Amazon Rainforest

Deforestation in the amazon rainforest.

The Amazon rainforest area spans about 8,200,000km 2 across 9 countries, making it the largest rainforest in the world. The tree coverage in 1970 was 4.1m km 2 . In 2018, it was 3.3m km 2 . Between 2001 and 2013, the causes of Amazonian deforestation were:

Pasture and cattle ranching = 63%

Small-scale, subsistence farmers = 12%

Commercial crop farming = 7%

Tree felling and logging = 6%

Other activities = 3%

• E.g. plantations, mining, road-building, and construction.

Impacts of Deforestation in the Amazon

Deforestation in the Amazon rainforest has the following environmental and economic impacts:

Environmental impact of Amazonian deforestation

• Photosynthesis by trees in the Amazon absorbs 5% of the world's carbon emissions each year (2bn tons of CO2).
• 100 billion tonnes of carbon are stored in the wood of the trees in the Amazon.
• If the Amazon were completely deforested, it would release the 100bn tonnes and also reduce the amount of carbon dioxide taken out of the atmosphere by 2bn tons each year.
• Trees anchor soil in the ground, bound to their roots. Deforestation damages the topsoil and once this has happened, the fertility of the ground is seriously damaged.

Economic impact of Amazonian deforestation

• Deforestation has fuelled the economic development of poor countries.
• In 2018, Brazil exported $28bn worth of metals. The mining industry creates jobs, exports and helps increase Brazilian people's standard of living.
• Similarly, hydroelectric power plants and cattle farms help to create jobs.
• In 2018, Brazil became the world's largest exporter of beef.
• Rio Tinto, an iron ore mining company employs 47,000 people globally and thousands of these are in Brazil.

The rate of deforestation in the Amazon

• In 2015, the Brazilian President Dilma Rousseff claimed that the rate of deforestation had fallen by 83% and that actually Brazil was going to reforest the Amazon.
• However, the policies under President Temer and President Bolsonaro has reversed Rousseff's plan. In 2019, under Bolsonaro, the rate of deforestation was increasing again.

1 The Challenge of Natural Hazards

1.1 Natural Hazards

1.1.1 Types of Natural Hazards

1.1.2 Hazard Risk

1.1.3 Consequences of Natural Hazards

1.1.4 End of Topic Test - Natural Hazards

1.1.5 Exam-Style Questions - Natural Hazards

1.2 Tectonic Hazards

1.2.1 Tectonic Plates

1.2.2 Tectonic Plates & Convection Currents

1.2.3 Plate Margins

1.2.4 Volcanoes

1.2.5 Effects of Volcanoes

1.2.6 Responses to Volcanic Eruptions

1.2.7 Earthquakes

1.2.8 Earthquakes 2

1.2.9 Responses to Earthquakes

1.2.10 Case Studies: The L'Aquila & Kashmir Earthquakes

1.2.11 Earthquake Case Study: Chile 2010

1.2.12 Earthquake Case Study: Nepal 2015

1.2.13 Living with Tectonic Hazards 1

1.2.14 Living with Tectonic Hazards 2

1.2.15 End of Topic Test - Tectonic Hazards

1.2.16 Exam-Style Questions - Tectonic Hazards

1.2.17 Tectonic Hazards - Statistical Skills

1.3 Weather Hazards

1.3.1 Global Atmospheric Circulation

1.3.2 Surface Winds

1.3.3 UK Weather Hazards

1.3.4 Tropical Storms

1.3.5 Features of Tropical Storms

1.3.6 Impact of Tropical Storms 1

1.3.7 Impact of Tropical Storms 2

1.3.8 Tropical Storms Case Study: Katrina

1.3.9 Tropical Storms Case Study: Haiyan

1.3.10 UK Weather Hazards Case Study: Somerset 2014

1.3.11 End of Topic Test - Weather Hazards

1.3.12 Exam-Style Questions - Weather Hazards

1.3.13 Weather Hazards - Statistical Skills

1.4 Climate Change

1.4.1 Evidence for Climate Change

1.4.2 Causes of Climate Change

1.4.3 Effects of Climate Change

1.4.4 Managing Climate Change

1.4.5 End of Topic Test - Climate Change

1.4.6 Exam-Style Questions - Climate Change

1.4.7 Climate Change - Statistical Skills

2 The Living World

2.1 Ecosystems

2.1.1 Ecosystems

2.1.2 Ecosystem Cascades & Global Ecosystems

2.1.3 Ecosystem Case Study: Freshwater Ponds

2.2 Tropical Rainforests

2.2.1 Tropical Rainforests - Intro & Interdependence

2.2.2 Adaptations

2.2.3 Biodiversity of Tropical Rainforests

2.2.4 Deforestation

2.2.5 Case Study: Deforestation in the Amazon Rainforest

2.2.6 Sustainable Management of Rainforests

2.2.7 Case Study: Malaysian Rainforest

2.2.8 End of Topic Test - Tropical Rainforests

2.2.9 Exam-Style Questions - Tropical Rainforests

2.2.10 Deforestation - Statistical Skills

2.3 Hot Deserts

2.3.1 Overview of Hot Deserts

2.3.2 Biodiversity & Adaptation to Hot Deserts

2.3.3 Case Study: Sahara Desert

2.3.4 Desertification

2.3.5 Case Study: Thar Desert

2.3.6 End of Topic Test - Hot Deserts

2.3.7 Exam-Style Questions - Hot Deserts

2.4 Tundra & Polar Environments

2.4.1 Overview of Cold Environments

2.4.2 Adaptations in Cold Environments

2.4.3 Biodiversity in Cold Environments

2.4.4 Case Study: Alaska

2.4.5 Sustainable Management

2.4.6 Case Study: Svalbard

2.4.7 End of Topic Test - Tundra & Polar Environments

2.4.8 Exam-Style Questions - Cold Environments

3 Physical Landscapes in the UK

3.1 The UK Physical Landscape

3.1.1 The UK Physical Landscape

3.2 Coastal Landscapes in the UK

3.2.1 Types of Wave

3.2.2 Weathering & Mass Movement

3.2.3 Processes of Erosion & Wave-Cut Platforms

3.2.4 Headlands, Bays, Caves, Arches & Stacks

3.2.5 Transportation

3.2.6 Deposition

3.2.7 Spits, Bars & Sand Dunes

3.2.8 Case Study: Landforms on the Dorset Coast

3.2.9 Types of Coastal Management 1

3.2.10 Types of Coastal Management 2

3.2.11 Coastal Management Case Study - Holderness

3.2.12 Coastal Management Case Study: Swanage

3.2.13 Coastal Management Case Study - Lyme Regis

3.2.14 End of Topic Test - Coastal Landscapes in the UK

3.2.15 Exam-Style Questions - Coasts

3.3 River Landscapes in the UK

3.3.1 The River Valley

3.3.2 River Valley Case Study - River Tees

3.3.3 Erosion

3.3.4 Transportation & Deposition

3.3.5 Waterfalls, Gorges & Interlocking Spurs

3.3.6 Meanders & Oxbow Lakes

3.3.7 Floodplains & Levees

3.3.8 Estuaries

3.3.9 Case Study: The River Clyde

3.3.10 River Management

3.3.11 Hard & Soft Flood Defences

3.3.12 River Management Case Study - Boscastle

3.3.13 River Management Case Study - Banbury

3.3.14 End of Topic Test - River Landscapes in the UK

3.3.15 Exam-Style Questions - Rivers

3.4 Glacial Landscapes in the UK

3.4.1 Erosion

3.4.2 Landforms Caused by Erosion

3.4.3 Landforms Caused by Transportation & Deposition

3.4.4 Snowdonia

3.4.5 Land Use in Glaciated Areas

3.4.6 Tourism in Glacial Landscapes

3.4.7 Case Study - Lake District

3.4.8 End of Topic Test - Glacial Landscapes in the UK

3.4.9 Exam-Style Questions - Glacial Landscapes

4 Urban Issues & Challenges

4.1 Urban Issues & Challenges

4.1.1 Urbanisation

4.1.2 Urbanisation Case Study: Lagos

4.1.3 Urbanisation Case Study: Rio de Janeiro

4.1.4 UK Cities

4.1.5 Case Study: Urban Regen Projects - Manchester

4.1.6 Case Study: Urban Change in Liverpool

4.1.7 Case Study: Urban Change in Bristol

4.1.8 Sustainable Urban Life

4.1.9 End of Topic Test - Urban Issues & Challenges

4.1.10 Exam-Style Questions - Urban Issues & Challenges

4.1.11 Urban Issues -Statistical Skills

5 The Changing Economic World

5.1 The Changing Economic World

5.1.1 Measuring Development

5.1.2 Classifying Countries Based on Wealth

5.1.3 The Demographic Transition Model

5.1.4 Physical & Historical Causes of Uneven Development

5.1.5 Economic Causes of Uneven Development

5.1.6 How Can We Reduce the Global Development Gap?

5.1.7 Case Study: Tourism in Kenya

5.1.8 Case Study: Tourism in Jamaica

5.1.9 Case Study: Economic Development in India

5.1.10 Case Study: Aid & Development in India

5.1.11 Case Study: Economic Development in Nigeria

5.1.12 Case Study: Aid & Development in Nigeria

5.1.13 Economic Development in the UK

5.1.14 Economic Development UK: Industry & Rural

5.1.15 Economic Development UK: Transport & North-South

5.1.16 Economic Development UK: Regional & Global

5.1.17 End of Topic Test - The Changing Economic World

5.1.18 Exam-Style Questions - The Changing Economic World

5.1.19 Changing Economic World - Statistical Skills

6 The Challenge of Resource Management

6.1 Resource Management

6.1.1 Global Distribution of Resources

6.1.2 Food in the UK

6.1.3 Water in the UK 1

6.1.4 Water in the UK 2

6.1.5 Energy in the UK

6.1.6 Resource Management - Statistical Skills

6.2.1 Areas of Food Surplus & Food Deficit

6.2.2 Food Supply & Food Insecurity

6.2.3 Increasing Food Supply

6.2.4 Case Study: Thanet Earth

6.2.5 Creating a Sustainable Food Supply

6.2.6 Case Study: Agroforestry in Mali

6.2.7 End of Topic Test - Food

6.2.8 Exam-Style Questions - Food

6.2.9 Food - Statistical Skills

6.3.1 The Global Demand for Water

6.3.2 What Affects the Availability of Water?

6.3.3 Increasing Water Supplies

6.3.4 Case Study: Water Transfer in China

6.3.5 Sustainable Water Supply

6.3.6 Case Study: Kenya's Sand Dams

6.3.7 Case Study: Lesotho Highland Water Project

6.3.8 Case Study: Wakel River Basin Project

6.3.9 Exam-Style Questions - Water

6.3.10 Water - Statistical Skills

6.4.1 Global Demand for Energy

6.4.2 Factors Affecting Energy Supply

6.4.3 Increasing Energy Supply: Renewables

6.4.4 Increasing Energy Supply: Non-Renewables

6.4.5 Carbon Footprints & Energy Conservation

6.4.6 Case Study: Rice Husks in Bihar

6.4.7 Exam-Style Questions - Energy

6.4.8 Energy - Statistical Skills

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Deforestation

Sustainable Management of Rainforests

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73 Case Study: The Amazon Rainforest

The amazon in context.

Tropical rainforests are often considered to be the “cradles of biodiversity.” Though they cover only about 6% of the Earth’s land surface, they are home to over 50% of global biodiversity. Rain forests also take in massive amounts of carbon dioxide and release oxygen through photosynthesis, which has also given them the nickname “lungs of the planet.” They also store very large amounts of carbon, and so cutting and burning their biomass contributes to global climate change. Many modern medicines are derived from rainforest plants, and several very important food crops originated in the rainforest, including bananas, mangos, chocolate, coffee, and sugar cane.

In order to qualify as a tropical rainforest, an area must receive over 250 centimeters of rainfall each year and have an average temperature above 24 degrees centigrade, as well as never experiencing frosts. The Amazon rainforest in South America is the largest in the world. The second largest is the Congo in central Africa, and other important rainforests can be found in Central America, the Caribbean, and Southeast Asia. Brazil contains about 40% of the world’s remaining tropical rainforest. Its rainforest covers an area of land about 2/3 the size of the continental United States.

There are countless reasons, both anthropocentric and ecocentric, to value rainforests. But they are one of the most threatened types of ecosystems in the world today. It’s somewhat difficult to estimate how quickly rainforests are being cut down, but estimates range from between 50,000 and 170,000 square kilometers per year. Even the most conservative estimates project that if we keep cutting rainforests as we are today, within about 100 years there will be none left.

How does a rainforest work?

Rainforests are incredibly complex ecosystems, but understanding a few basics about their ecology will help us understand why clear-cutting and fragmentation are such destructive activities for rainforest biodiversity.

High biodiversity in tropical rainforests means that the interrelationships between organisms are very complex. A single tree may house more than 40 different ant species, each of which has a different ecological function and may alter the habitat in distinct and important ways. Ecologists debate about whether systems that have high biodiversity are stable and resilient, like a spider web composed of many strong individual strands, or fragile, like a house of cards. Both metaphors are likely appropriate in some cases. One thing we can be certain of is that it is very difficult in a rainforest system, as in most others, to affect just one type of organism. Also, clear cutting one small area may damage hundreds or thousands of established species interactions that reach beyond the cleared area.

Pollination is a challenge for rainforest trees because there are so many different species, unlike forests in the temperate regions that are often dominated by less than a dozen tree species. One solution is for individual trees to grow close together, making pollination simpler, but this can make that species vulnerable to extinction if the one area where it lives is clear cut. Another strategy is to develop a mutualistic relationship with a long-distance pollinator, like a specific bee or hummingbird species. These pollinators develop mental maps of where each tree of a particular species is located and then travel between them on a sort of “trap-line” that allows trees to pollinate each other. One problem is that if a forest is fragmented then these trap-line connections can be disrupted, and so trees can fail to be pollinated and reproduce even if they haven’t been cut.

The quality of rainforest soils is perhaps the most surprising aspect of their ecology. We might expect a lush rainforest to grow from incredibly rich, fertile soils, but actually, the opposite is true. While some rainforest soils that are derived from volcanic ash or from river deposits can be quite fertile, generally rainforest soils are very poor in nutrients and organic matter. Rainforests hold most of their nutrients in their live vegetation, not in the soil. Their soils do not maintain nutrients very well either, which means that existing nutrients quickly “leech” out, being carried away by water as it percolates through the soil. Also, soils in rainforests tend to be acidic, which means that it’s difficult for plants to access even the few existing nutrients. The section on slash and burn agriculture in the previous module describes some of the challenges that farmers face when they attempt to grow crops on tropical rainforest soils, but perhaps the most important lesson is that once a rainforest is cut down and cleared away, very little fertility is left to help a forest regrow.

What is driving deforestation in the Amazon?

Many factors contribute to tropical deforestation, but consider this typical set of circumstances and processes that result in rapid and unsustainable rates of deforestation. This story fits well with the historical experience of Brazil and other countries with territory in the Amazon Basin.

Population growth and poverty encourage poor farmers to clear new areas of rainforest, and their efforts are further exacerbated by government policies that permit landless peasants to establish legal title to land that they have cleared.

At the same time, international lending institutions like the World Bank provide money to the national government for large-scale projects like mining, construction of dams, new roads, and other infrastructure that directly reduces the forest or makes it easier for farmers to access new areas to clear.

The activities most often encouraging new road development are timber harvesting and mining. Loggers cut out the best timber for domestic use or export, and in the process knock over many other less valuable trees. Those trees are eventually cleared and used for wood pulp, or burned, and the area is converted into cattle pastures. After a few years, the vegetation is sufficiently degraded to make it not profitable to raise cattle, and the land is sold to poor farmers seeking out a subsistence living.

Regardless of how poor farmers get their land, they often are only able to gain a few years of decent crop yields before the poor quality of the soil overwhelms their efforts, and then they are forced to move on to another plot of land. Small-scale farmers also hunt for meat in the remaining fragmented forest areas, which reduces the biodiversity in those areas as well.

Another important factor not mentioned in the scenario above is the clearing of rainforest for industrial agriculture plantations of bananas, pineapples, and sugar cane. These crops are primarily grown for export, and so an additional driver to consider is consumer demand for these crops in countries like the United States.

These cycles of land use, which are driven by poverty and population growth as well as government policies, have led to the rapid loss of tropical rainforests. What is lost in many cases is not simply biodiversity, but also valuable renewable resources that could sustain many generations of humans to come. Efforts to protect rainforests and other areas of high biodiversity is the topic of the next section.

Introduction to Geography Copyright © by Petra Tschakert; Karl Zimmerer; Brian King; Seth Baum; and Chongming Wang is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License , except where otherwise noted.

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Trouble in the Amazon

The rainforest is starting to release its carbon.

Is it heading towards a tipping point?

24 August 2023

By Daniel Grossman

Photographs by Dado Galdieri/Hilaea Media for Nature

Video by Patrick Vanier/Hilaea Media for Nature

Climate change, deforestation and other human threats are driving the Amazon towards the limits of survival.

Researchers are racing to chart its future.

The Pulitzer Center in Washington DC supported travel for Daniel Grossman and for photographer Dado Galdieri and videographer Patrick Vanier.

This article is also available as a pdf version .

Luciana Gatti stares grimly out of the window of the small aircraft as it takes off from the city of Santarém, Brazil, in the heart of the eastern Amazon forest. Minutes into the flight, the plane passes over a 30-kilometre stretch of near-total ecological devastation. It’s a patchwork of farmland, filled with emerald-green corn stalks and newly clear-cut plots where the rainforest once stood.

“This is awful. So sad,” says Gatti, a climate scientist at the National Institute for Space Research in São José dos Campos, Brazil.

Gatti is part of a broad group of scientists attempting to forecast the future of the Amazon rainforest. The land ecosystems of the world together absorb about 30% of the carbon dioxide released by burning fossil fuels; scientists think that most of this takes place in forests, and the Amazon is by far the world’s largest contiguous forest.

Rows of black-pepper plants grow in a field near Santarém that was formerly rainforest.

Since 2010, Gatti has collected air samples over the Amazon in planes such as this one, to monitor how much CO 2 the forest absorbs. In 2021, she reported data from 590 flights that showed that the Amazon forest’s uptake — its carbon sink — is weak over most of its area 1 . In the southeastern Amazon, the forest has become a source of CO 2 .

The finding gained headlines around the world and surprised many scientists, who expected the Amazon to be a much stronger carbon sink. For Carlos Nobre, a climate scientist at the University of São Paulo Institute of Advanced Studies in Brazil, the change was happening much too soon. In 2016, using climate models, he and his colleagues predicted that the combination of unchecked deforestation and global climate change would eventually push the Amazon forest past a “tipping point” , transforming the climate across a vast swathe of the Amazon 2 . Then, the conditions that support a lush, closed-canopy forest would no longer exist. Gatti’s observations seem to show the early signs of what he forecast, Nobre says.

A dealership for the farming equipment company John Deere sits at the edge of the rainforest in Santarém.

“What we were predicting to happen perhaps in two or three decades is already taking place,” says Nobre, who was one of a dozen co-authors of the paper with Gatti.

I’ve travelled to Santarém, where the Tapajós River joins the Amazon River, to join Gatti and other scientists trying to determine whether the forest is heading for an irreversible transformation towards a degraded form of savannah. Another big question is whether the forest can still be saved by slowing climate change, halting Amazon deforestation and restoring its damaged lands, something Nobre suggests is possible.

The large-scale deforestation we saw from the air is the most visible threat to the Amazon. But the forest is suffering in other, less-obvious ways. Erika Berenguer, an ecologist at the University of Oxford and Lancaster University, UK, has found that even intact forest is no longer as healthy as it once was, because of forces such as climate change and the impacts of agriculture that spill beyond farm borders. Earlier this year, a large international team of researchers, including Berenguer, reported that such changes were having effects across 38% of the intact Amazon forest 3 .

Gatti first visited Santarém in the late 1990s, when most of the farming in this part of the Amazon was practised by smallholders for subsistence purposes. Now, she’s astounded by the scale of destruction that has ravaged the jungle. While passing over one huge, newly razed parcel of Amazon forest, Gatti’s voice crackles over the plane’s intercom. “They are killing the forest to transform everything into soy beans.”

Breath of the forest

The plane that collects air samples for Gatti is housed in a cavernous hangar at Santarém airport. On a rainy day in May, she visits the hangar to meet with Washington Salvador, one of her regular pilots. Gatti checks on the rugged plastic suitcases she has had shipped to Santarém and stored in her tiny office at the airport. Inside them, cradled in foam, are 12 sturdy glass flasks the size and shape of one-litre soft-drink bottles.

Luciana Gatti (right) prepares for a flight that will collect air samples over the Amazon forest.

Climate scientist Luciana Gatti stands at the top of a tower above the canopy, watching one of the aeroplanes that collects air samples over the forest.

Luciana Gatti discusses threats to the rainforest.

The problem is that we are advancing a lot in deforestation.

There is a moratorium that is not being obeyed.

When we compare the size of the deforested area from 2010 to 2018 and look at the years 2019 and 2020, which were part of the Bolsonaro government, we see an increase in 70% of planted areas for soy, 60% for corn and 13% for cattle raising.

So a very large increase is happening.

The moratoriums, the agreements are not being respected.

Gatti doesn’t need to accompany Salvador when he collects the samples. That’s fortunate, because she gets air sick flying in small planes. The pilots who work with her fly twice a month to a specific sampling location, one in each quadrant of the Amazon basin. Once they reach an altitude of 4,420 metres over a landmark, the pilot presses a button, opening valves and turning on a compressor that fills the first flask with air taken through a nozzle from outside. Then, they dive in a steep, tight spiral centred around the landmark, collecting 11 more samples, each at a specified altitude. At the final level, the pilot practically buzzes the canopy, sometimes barely 100 metres above the ground.

In her laboratory at the National Institute for Space Research, Gatti measures the amount of CO 2 in the samples. She calculates how much the forest soaks up (or releases) by comparing her measurements with those taken over the Atlantic Ocean, which is upstream of the trade winds that blow over the Amazon.

This patch of the rainforest in the eastern Amazon has been carved up into an array of fields. (Video contains the sound of an aeroplane engine).

Flasks used for sampling air above the rainforest. Luciana Gatti and her colleagues use these samples to determine how carbon dioxide moves into and out of the forest.

Scott Denning, an atmospheric scientist at Colorado State University in Fort Collins who has collaborated with Gatti, says that her research has been an “amazingly logistically difficult project”. “The beauty of Luciana’s work, and also the difficulty of her work, is that she’s done it over and over and over again, every two weeks for ten years.”

Fading forest

Air samples taken over the Amazon rainforest at five sites (orange dots) track the movement of carbon dioxide into and out of the forest between 2010 and 2018. By measuring the total flow of carbon (black) and subtracting that released by fires (grey), researchers calculate the net flux (orange). Negative values indicate carbon sinks — areas that absorb more than they naturally emit. The southeast has become a carbon source, releasing more than it absorbs.

Carbon movement

Flux from fire

Total carbon flux

Forest cover

Regional carbon flux

(grams of carbon

per square metre per day)

Measurement sites

Nature publications remain neutral with regard to contested jurisdictional claims in published maps.

Source: Ref. 1

Regional carbon flux (grams of carbon

Lax enforcement

Some of the forces transforming the Amazon biome are on display at Santarém’s port, where a trio of eight-storey-high silos looms over the city’s fish market. Each silo can hold 18,000 tonnes of maize (corn) or soya beans, waiting to be shipped to other parts of Brazil and then around the globe. As of 2017, more than 13% of the Amazon’s old-growth forest had been cleared, largely for ranching and for growing crops. Almost two-thirds of the biome is in Brazil, which had lost more than 17% of such forest by that year, and its deforestation rates surged in 2019 during the administration of former president Jair Bolsonaro.

A trio of grain silos stands near the edge of Santarém.

Brazil’s Forest Code is supposed to protect the country’s woods. One key provision requires that in the Amazon, 80% of any plot, a portion known as the Legal Reserve, must be left intact. But many scientists and forest activists argue that lax enforcement makes it too easy to circumvent the law, and that fines for not complying aren’t effective deterrents because they are rarely paid.

Also, people often get title to public or Indigenous land that they illegally occupy and clear, through a process called land grabbing. Philip Fearnside, an ecologist at Brazil’s National Institute for Research in Amazonia in Manaus, says, “Brazil is basically the only country where you can still go into the forest and start clearing and expect to come out with a land title. It’s like the Wild West of North America in the eighteenth century.”

After a one-hour drive south from Santarém, we meet the Indigenous chief — the cacique — of the tiny village of Açaizal in the reservation known as Terra Munduruku do Planalto. He sits on a deck at a rough-hewn wooden table, positioned so he can watch for unwanted outsiders who might drive past.

Josenildo Munduruku, leader of his tribe, in a school with some of his students.

Josenildo Munduruku — as is customary, his surname is the same as his tribe — says that decades ago, non-Indigenous homesteaders began establishing smallholdings on land that he and his ancestors had occupied for generations. He says that they built houses and opened up cattle pastures without ever asking permission or obtaining legal rights. Previous generations of his community didn’t object. “Our parents did not have this type of understanding — they were not concerned about it,” he says.

The land eventually ended up in the hands of commercial growers, who buy up adjacent plots then raze huge swathes of jungle. “They do not care about these trees from which we extract medicine. For them, these trees are meaningless, useless,” says Munduruku. He says that his community has tried unsuccessfully to get help from the government to recover some of the land.

Maize (corn) grows in a field in the Munduruku territory next to intact rainforest.

A farmer harvests a field in a deforested area near Santarém.

The high value of some tropical hardwoods also threatens the forest. Off a highway just west of Açaizal, a timber-mill worker sends a massive log through an industrial saw, which slices off a plank as thick as an encyclopedia. Other workers shape the rough board into standard dimensions.

Ricardo Veronese, the timber mill’s owner, says that his family members, a small lumber dynasty, came to the state of Pará from Mato Grosso state 17 years ago. “We came to Pará because there was plenty of virgin forest left,” he says. The situation in Mato Grosso is different: since the mid-1980s, roughly 40% of its rainforest has been cut down 4 .

Every year, Veronese’s mill saws up about 2,000 giant trees, mostly for high-end flooring and porch decks in the United States and Europe. With obvious pride, he says that he takes only “sustainably harvested” wood. The huge trunks, stacked by the score in a yard, come from state-regulated logging operations that practise selective logging, he says, where only large trees are cut, leaving the remaining trees to grow and fill gaps in the canopy. And he says that his company follows the government’s rules for selective logging, which require firms to take steps to reduce their impact.

But many ecologists say that the selective logging permitted by the Forest Code is often not sustainable. That’s because the trees that are removed are generally slow-growing species with dense wood, whereas the species that grow back have less-dense wood, so they absorb less carbon in the same space. And few companies follow the requirements for selective logging , such as limiting road construction or the number of trees cut. “About 90% of selective logging in the Amazon is estimated as illegal, and therefore doesn’t follow any of these procedures,” says Berenguer.

A sawmill processes logs from the rainforest on the outskirts of Santarém.

Carbon counting

It takes patience and perseverance to monitor the Amazon for long periods. Berenguer and her team have been measuring 6,000 trees in the Tapajós National Forest every three months since 2015. From this, they estimate changes in the amount of biomass in the forest, and how much carbon is stored there 5 .

Censuses such as these, and atmospheric measurements such as Gatti’s, are two common techniques climate scientists use to study the uptake and release of carbon. Each has strengths and drawbacks.

The censuses directly measure the amount of carbon (in the form of wood) in a forest. If paired with measurements of debris on the ground and CO 2 released from soil, they can also take account of decay. But censuses look only at a limited number of sites. Atmospheric measurements can assess the combined impact of changes in forests at regional and even continental scales. But it’s hard to decipher the cause of any changes they show.

In 2010, Berenguer began monitoring more than 20 plots in and around the Tapajós forest. Her goal was to compare the carbon uptake of primary forest with that of jungle degraded by selective logging — legal and otherwise. But in 2015, an unprecedented heat wave and drought hit the eastern Amazon.

Eight of Berenguer’s plots were burnt, killing hundreds of trees that she’d measured at least twice. She recalls the day in 2015 that she visited a recently scorched plot. Her assistant, Gilson Oliveira, had run ahead. “And he just started screaming, ‘Oh tree number 71 is dead. Tree number 114 is burning,’” Her equipment was destroyed. Some favourite trees had died. “I just collapsed crying; just sat down in the ashes.”

Under normal conditions, the Amazon forest is almost fireproof. It’s too wet to burn. But by the time this long dry season ended, fires had scorched one million hectares of primary forest in the eastern Amazon, an area the size of Lebanon, killing an estimated 2.5 billion trees and producing as much CO 2 as Brazil releases from burning fossil fuels in a year 5 . Some of Berenguer’s research was, literally, reduced to ashes. Still, she saw the chance to study a problem that is expected to become increasingly common: the combined effect of multiple issues, such as severe drought, fires and human degradation caused by selective logging and clear-cutting.

A patch of former rainforest in the Munduruku territory has been cleared of trees and will be burnt before it is planted. The impacts and fires spread into the rainforest beyond the edge of the field.

On a tour of where Berenguer’s team works in the Tapajós forest, her field director, Marcos Alves, takes us to a site that burnt in 2015. Not long before the fire, illegal loggers removed the biggest, most economically valuable trees. The forest has grown back with plenty of vegetation, including some fast-growing species that are already as thick as telephone poles. But there are none of the giants that can be found elsewhere in the forest.

Alves and Oliveira take Gatti and me to a site three kilometres up the highway that has never been selectively logged or clear cut, and which escaped the 2015 fires. It’s dimmer here because the high canopy is so thick. And it’s noticeably cooler: not only do the trees block sunlight, but they also transpire vast quantities of water, which chills the air.

Gatti marvels at the size of a Brazil-nut tree ( Bertholletia excelsa ) that forms part of the canopy. “It’s amazing! How much water this tree puts into the air.”

Luciana Gatti stands between the buttresses of a giant samauma tree ( Ceiba pentandra ), which she often visits on trips to the eastern Amazon.

In 2021, Berenguer and a team of co-authors from Brazil and Europe published a study 5 of carbon uptake and tree mortality in her plots during the first three years after the 2015–16 burning. They compared plots that had been selectively logged or had burnt in the years before 2015–16, with ones that had not been logged or burnt. The study found that more trees died in degraded plots.

Although plots that weren’t degraded fared the best in her study, Berenguer says that there is no such thing as “pristine forest” any more. Climate change has warmed the entire Amazon forest by 1 °C in the past 60 years. The eastern Amazon has warmed even more.

Amazon rainfall has not changed appreciably, when averaged over the year. But the dry season, when rain is needed most, is becoming longer, especially in the northeastern Amazon, where dry-season rainfall decreased by 34% between 1979 and 2018 1 . In the southeastern Amazon, the season now lasts about 4 weeks longer than it did 40 years ago, putting stress on trees, especially the big ones. Still, Berenguer says that, so far, the measurable effects of climate change on the forest are relatively subtle compared with those of direct human impacts such as logging.

Fading forests

David Lapola, an Earth-system modeller at Brazil’s University of Campinas, says that deforestation alone can’t explain why the Amazon carbon sink has weakened — and has reversed in the southeast. He and more than 30 colleagues, including Gatti and Berenguer, published an analysis this year noting that carbon emissions resulting from degradation equal — or exceed — those from clear-cutting deforestation 3 .

Widespread threats

The area of intact Amazon forest that has been degraded by different forces exceeds the area that has been deforested by clear-cutting. Three main drivers of degradation are fires, selective timber extraction and edge effects that harm the forest near areas that have been cleared or burnt. Severe droughts can also cause degradation.

5.5% of total remaining Amazon forest degraded

Fire, edge effects

and timber extraction

Deforestation

Forest degradation

2001–18 (thousand km 2 )

Number of severe

Area affected by selective timber

Extent of edge effects

(km 2 , log scale)

extraction (km 2 , log scale)

droughts 2001–18

Source: Ref. 3

Area affected by

selective timber

5.5% of total

remaining Amazon forest degraded

Number of severe droughts 2001–18

Area burnt (km 2 , log scale)

Extent of edge effects (km 2 , log scale)

What’s more, even intact forest with no obvious local human impacts is accumulating less carbon than it used to, as seen in some tree-census studies. A 2015 analysis 6 of 321 plots of Amazon primary forest with no overt human impacts reported “a long-term decreasing trend of carbon accumulation”. A similar study 7 published in 2020 reported the same things in the Congo Basin forest — the world’s second-largest tropical jungle.

That’s a change from previous decades, when censuses indicated that such primary forest in the Amazon was storing more carbon. There is no consensus explanation for these slowdowns, or why primary forest was accumulating carbon. But many researchers suspect that the carbon gains in previous decades stem from the influence of extra CO 2 in the atmosphere, which can stimulate the growth of plants. In some studies that expose large forest plots to elevated CO 2 , known as free-air carbon enrichment (FACE) experiments, researchers have measured gains in biomass. But this effect lasted only a few years in one experiment 8 , and other studies have not yet determined whether the gains are temporary.

All of the forest FACE experiments have so far been conducted in temperate regions, however. And many scientists suspect that tropical forests — and the Amazon, in particular — might follow different rules. The first tropical-forest FACE experiment is finally under construction, 50 kilometres north of Manaus. Nobre says that it could help to predict whether continued increases in CO 2 will benefit the Amazon.

For several decades, Nobre and his students have used computer models to forecast how climate change and deforestation will affect the Amazon. The research grew, in part, from work in the 1970s showing that the Amazon forest itself helps to create the conditions that nourish it 9 . Moisture blowing in from the Atlantic falls as rain in the eastern Amazon and is then transpired and blown farther west. It recycles several times before reaching the Andes. A smaller or seriously degraded forest would recycle less water, and eventually might not be able to support the lush, humid forest.

In their 2016 study 2 , Nobre and several colleagues estimated the Amazon would reach a tipping point if the planet warms by more than 2.5 °C above pre-industrial temperatures and if 20–25% of the Amazon is deforested. The planet is on track to reach 2.5 °C of warming by 2100, according to a report released by the United Nations last October .

Nobre now wonders whether his earlier study was too conservative. “What Luciana Gatti’s paper shows is that this whole area in the southern Amazon is becoming a carbon source.” He is convinced that, although the Amazon is not at the tipping point yet, it might be soon.

Susan Trumbore, director of the Max Planck Institute of Biogeochemistry in Jena, Germany, is not a fan of using the term tipping point, a phrase with no precise definition, to discuss the Amazon. But she says that the forest’s future is in question. “We all think of a tipping point as it’s going to happen and it’s going to happen fast. I have a feeling that it’s going to be a gradual alteration of the ecosystem that we know is coming with climate change,” she says. Regardless of whether the change will be fast or slow, Trumbore agrees with the majority of scientists who study the Amazon that it is facing serious challenges that might have global ramifications.

Luciana Gatti climbs a tower that rises above the canopy in the rainforest.

Some of those challenges are directly linked to politics in the region. On 23 August, Gatti and her colleagues reported that assaults on the Amazon — including deforestation, burning and degradation — had increased dramatically in 2019 and 2020 as a result of declines in law enforcement. And that doubled the carbon emissions from the region 10 .

The fate of the Amazon is on Gatti’s mind as she climbs a lattice tower in the Tapajós forest — one of the landmarks her pilots fly over as they collect air samples. The metal structure rattles and creaks as she ascends. On the deck, 15 storeys above the ground, she gazes at the forest spreading in all directions out to the horizon. It looks unblemished. But she says that it is suffering.

“We are killing this ecosystem directly and indirectly,” she says, choking up. She wipes a tear from her eye. “This is what scares me terribly and why it’s affecting me so much when I come here. I’m observing the forest dying.”

Trees in the rainforest pump tremendous amounts of water vapour into the atmosphere through the process of evapotranspiration. Cleared land releases much less moisture, drying out nearby areas of the forest.

Daniel Grossman is a freelance reporter in Watertown, Massachusetts.

Mariana Lenharo contributed translations.

• Author: Daniel Grossman
• Photographer: Dado Galdieri
• Videographer: Patrick Vanier
• Media editor: Amelia Hennighausen
• Subeditor: Anne Haggart
• Art editor: Chris Ryan
• Editor: Richard Monastersky
• Gatti, L. V. et al. Nature 595 , 388–393 (2021).
• Nobre, C. A. et al. Proc. Natl Acad. Sci. USA 113 , 10759–10768 (2016).
• Lapola, D. M. et al. Science 379 , eabp8622 (2023).
• Griffiths, P., Jakimow, B. & Hostert, P. Remote Sens. Environ. 216 , 497–513 (2018).
• Berenguer, E. et al. Proc. Natl Acad. Sci. USA 118 , e2019377118 (2021).
• Brienen, R. J. W. et al. Nature 519 , 344–348 (2015).
• Hubau, W. et al. Nature 579 , 80–87 (2020).
• Norby R. J., Warren, J. M., Iversen, C. M., Medlyn, B. E. & McMurtrie, R. E. Proc. Natl Acad. Sci. USA 107 , 19368–19373 (2010).
• Salati, E., Dall’Olio, A., Matsui, E. & Gat, J. R. Water Resour. Res. 15 , 1250–1258 (1979).
• Gatti, L. V. et al. Nature https://doi.org/10.1038/s41586-023-06390-0 (2023).

Correction: A photo caption in an earlier version of this feature erroneously described a farmer as preparing a field near Santarém for planting. In fact, the field was being harvested.

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Increasing drought puts the resilience of the Amazon rainforest to the test

S ince 2015, the Amazon has been slower to recover from increasing drought events, but, overall, the rainforest still shows a remarkable resilience. New international research led by KU Leuven Earth and environmental scientists shows that forest degradation due to drought has been most pronounced in the southern Amazon, where human impact is greatest.

Since the turn of the century, four extreme droughts have occurred in the Amazon rainforest. Droughts of that kind should normally occur only once per century. This shows an evident increase in droughts in the largest rainforest on our planet.

In a new study, published in PNAS , researchers from the Department of Earth and Environmental Sciences and the KU Leuven Plant Institute analyze whether and to which extent the Amazon rainforest can withstand these changing conditions.

"The Amazon rainforest greatly depends on the internal rain cycle, where the forest produces part of its own rain through leaf transpiration," says doctoral researcher Johanna Van Passel, lead author of the paper. "Drought in one specific part can lead to forest degradation and dieback, which can, in turn, have negative effects for the rest of the rainforest."

Tipping point not (yet) reached

The researchers used monthly satellite images spanning from 2001 to 2019 to determine how the vegetation reacts to repeated periods of drought.

"The color of the tree canopy can give us information about the health and resilience of the forest," explains Professor Ben Somers. "The color always changes throughout the seasons, but if, over the course of the years, the trees need more and more time to recover, then something else is at play. In this case, we talk about 'critical slowing down,' which could mean that the ecosystem is about to reach a tipping point towards large-scale forest dieback and would eventually change into a degraded system with less diversity and complexity."

The results of the study show that, for now, the Amazon rainforest is not yet going to reach this kind of tipping point. "In general, the forest still shows great resilience, which is a positive and optimistic finding," says Van Passel. "We do see a considerable slowing down in the recovery of the tropical rainforest since 2015. This is most pronounced in the south, where the stability of the forest is under severe stress, and the human impact is greatest."

The researchers also found that mainly the intensity and duration of the drought periods led to forest degradation, more than the number of drought periods. "The intensity and frequency of droughts will very likely continue to increase due to climate change. It is therefore crucial that we try to protect the remaining resilience in most of the Amazon rainforest."

More information: Johanna Van Passel et al, Critical slowing down of the Amazon forest after increased drought occurrence, Proceedings of the National Academy of Sciences (2024). DOI: 10.1073/pnas.2316924121

Provided by KU Leuven

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Scientists call for conservation of Amazon's unseen water cycle

by Christine Calvo, Florida International University

Beyond the rainforests, scientists are zeroing in on changes occurring to a natural water cycle that could forever alter the Amazon.

The Amazon has always gone through periods of drought or abnormally heavy rainy seasons caused by the naturally occurring climate patterns of El Niño and La Niña. However, a recent increase in extreme climate events has led an international team of scientists to look more closely at the water cycles that connect the Atlantic Ocean to the Andes Mountains and distant parts of the Amazon. They have determined that human activity could be impacting this natural water cycle through river alteration, deforestation and climate change.

The work is published in the journal Proceedings of the National Academy of Sciences .

Elizabeth Anderson, an FIU freshwater scientist who co-led the research, says she and the other scientists are calling for greater emphasis on freshwaters in Amazon conservation to protect this cycle. Their recommendations include better data collection, improved access to data for scientists and conservation managers, stronger collaborations and zero-deforestation policies to stop the cutting down of trees.

For many years, scientists have talked about the importance of the pathway for water between the Andes Mountains and the Amazon lowlands, but until now, the significance of the Atlantic Ocean was not as quickly recognized. In the new study, scientists are trying to raise awareness about the Andes-Amazon-Atlantic (AAA) pathway in hopes of greater consideration of this pathway and freshwater resources in Amazon conservation.

"In this century, there's been a huge increase in the number and extent of protected areas like national parks , reserves and Indigenous territories that are recognized officially in the Amazon, but the focus has really been on forests and terrestrial ecosystems ," Anderson said. "It's now time to extend support for conservation to freshwater systems like rivers."

The AAA pathway is a giant, multi-directional water cycle that connects the Andes, Amazon and the Atlantic Ocean. About 90% of the Amazon Basin's total sediment comes from the Andes Mountains, travels down the Amazon and other rivers, and flows into the Atlantic Ocean. As global temperatures rise and the Amazon grapples with deforestation, the chances for extreme climate events that could disrupt this cycle increase.

The Amazon region is home to 47 million people. Spanning eight countries and one territory, the Amazon is the Earth's largest remaining rainforest. It sustains one-fifth of the world's freshwater biodiversity and is home to some of the planet's most diverse collections of birds, mammals, amphibians and plants. Its forests help mitigate global climate change. The future of the Amazon and its continued capacity to support the people, animals and plants living there fully depends on the connectivity of the AAA pathway.

Anderson points out an immediate need for integrated environmental management , conservation and governance approaches to sustain the AAA pathway. Within the scientists' recommendations, they suggest monitoring of all components of the AAA system; coordination across political boundaries for improved data collection and management; strengthening collaboration between interdisciplinary researchers, water managers, and local communities facing changes in the AAA pathway; and stopping deforestation, restoring vegetation, and mitigating climate change in the Amazon.

"We hope this study will bring the AAA pathway to become a commonly recognized system, fostering a more holistic understanding of Amazon freshwaters and how they are connected with people and nature in other parts of South America and the world," said Claire Beveridge, FIU courtesy postdoctoral and co-lead of this study.

In addition to Anderson and Beveridge, FIU researchers included Natalia Piland, Clinton Jenkins and Simone Athayde. Scientists from the Université Grenoble Alpes and the Université de Toulouse in France, Lancaster University in the U.K., the Pontificia Universidad Católica in Peru, University of São Paulo in Brazil, and Mississippi State University and Cornell University in the U.S. also contributed to this study.

Journal information: Proceedings of the National Academy of Sciences

Provided by Florida International University

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Case Study: The Amazon Rainforest

The amazon in context.

Tropical rainforests are often considered to be the “cradles of biodiversity.” Though they cover only about 6% of the Earth’s land surface, they are home to over 50% of global biodiversity. Rainforests also take in massive amounts of carbon dioxide and release oxygen through photosynthesis, which has also given them the nickname “lungs of the planet.” They also store very large amounts of carbon, and so cutting and burning their biomass contributes to global climate change. Many modern medicines are derived from rainforest plants, and several very important food crops originated in the rainforest, including bananas, mangos, chocolate, coffee, and sugar cane.

In order to qualify as a tropical rainforest, an area must receive over 250 centimeters of rainfall each year and have an average temperature above 24 degrees centigrade, as well as never experience frosts. The Amazon rainforest in South America is the largest in the world. The second largest is the Congo in central Africa, and other important rainforests can be found in Central America, the Caribbean, and Southeast Asia. Brazil contains about 40% of the world’s remaining tropical rainforest. Its rainforest covers an area of land about 2/3 the size of the continental United States.

There are countless reasons, both anthropocentric and ecocentric, to value rainforests. But they are one of the most threatened types of ecosystems in the world today. It’s somewhat difficult to estimate how quickly rainforests are being cut down, but estimates range from between 50,000 and 170,000 square kilometers per year. Even the most conservative estimates project that if we keep cutting down rainforests as we are today, within about 100 years there will be none left.

How does a rainforest work?

Rainforests are incredibly complex ecosystems, but understanding a few basics about their ecology will help us understand why clear-cutting and fragmentation are such destructive activities for rainforest biodiversity.

High biodiversity in tropical rainforests means that the interrelationships between organisms are very complex. A single tree may house more than 40 different ant species, each of which has a different ecological function and may alter the habitat in distinct and important ways. Ecologists debate about whether systems that have high biodiversity are stable and resilient, like a spider web composed of many strong individual strands, or fragile, like a house of cards. Both metaphors are likely appropriate in some cases. One thing we can be certain of is that it is very difficult in a rainforest system, as in most other ecosystems, to affect just one type of organism. Also, clear cutting one small area may damage hundreds or thousands of established species interactions that reach beyond the cleared area.

Pollination is a challenge for rainforest trees because there are so many different species, unlike forests in the temperate regions that are often dominated by less than a dozen tree species. One solution is for individual trees to grow close together, making pollination simpler, but this can make that species vulnerable to extinction if the one area where it lives is clear cut. Another strategy is to develop a mutualistic relationship with a long-distance pollinator, like a specific bee or hummingbird species. These pollinators develop mental maps of where each tree of a particular species is located and then travel between them on a sort of “trap-line” that allows trees to pollinate each other. One problem is that if a forest is fragmented then these trap-line connections can be disrupted, and so trees can fail to be pollinated and reproduce even if they haven’t been cut.

The quality of rainforest soils is perhaps the most surprising aspect of their ecology. We might expect a lush rainforest to grow from incredibly rich, fertile soils, but actually, the opposite is true. While some rainforest soils that are derived from volcanic ash or from river deposits can be quite fertile, generally rainforest soils are very poor in nutrients and organic matter. Rainforests hold most of their nutrients in their live vegetation, not in the soil. Their soils do not maintain nutrients very well either, which means that existing nutrients quickly “leech” out, being carried away by water as it percolates through the soil. Also, soils in rainforests tend to be acidic, which means that it’s difficult for plants to access even the few existing nutrients. The section on slash and burn agriculture in the previous module describes some of the challenges that farmers face when they attempt to grow crops on tropical rainforest soils, but perhaps the most important lesson is that once a rainforest is cut down and cleared away, very little fertility is left to help a forest regrow.

What is driving deforestation in the Amazon?

Many factors contribute to tropical deforestation, but consider this typical set of circumstances and processes that result in rapid and unsustainable rates of deforestation. This story fits well with the historical experience of Brazil and other countries with territory in the Amazon Basin.

Population growth and poverty encourage poor farmers to clear new areas of rainforest, and their efforts are further exacerbated by government policies that permit landless peasants to establish legal title to land that they have cleared.

At the same time, international lending institutions like the World Bank provide money to the national government for large-scale projects like mining, construction of dams, new roads, and other infrastructure that directly reduces the forest or makes it easier for farmers to access new areas to clear.

The activities most often encouraging new road development are timber harvesting and mining. Loggers cut out the best timber for domestic use or export, and in the process knock over many other less valuable trees. Those trees are eventually cleared and used for wood pulp, or burned, and the area is converted into cattle pastures. After a few years, the vegetation is sufficiently degraded to make it not profitable to raise cattle, and the land is sold to poor farmers seeking out a subsistence living.

Regardless of how poor farmers get their land, they often are only able to gain a few years of decent crop yields before the poor quality of the soil overwhelms their efforts, and then they are forced to move on to another plot of land. Small-scale farmers also hunt for meat in the remaining fragmented forest areas, which reduces the biodiversity in those areas as well.

Another important factor not mentioned in the scenario above is the clearing of rainforest for industrial agriculture plantations of bananas, pineapples, and sugar cane. These crops are primarily grown for export, and so an additional driver to consider is consumer demand for these crops in countries like the United States.

These cycles of land use, which are driven by poverty and population growth as well as government policies, have led to the rapid loss of tropical rainforests. What is lost in many cases is not simply biodiversity, but also valuable renewable resources that could sustain many generations of humans to come. Efforts to protect rainforests and other areas of high biodiversity is the topic of the next section.

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Anthony has covered Brazilian politics since 2012, the narrow 2022 election of leftist President Lula following four years of right-wing President Jair Bolsonaro, and the turbulence faced by Brazilian democracy. He has reported from Chile under General Pinochet and from Havana under Fidel Castro. He has also covered U.S.-Latin American affairs from Washington 1995-2002. Anthony holds an M.A. in Politics from Essex University.

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