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7 PowerPoint Templates for Impactful Climate Change Presentations

Last Updated on February 20, 2024 by Anastasia

If you’re planning to talk about ecology, circular economy, sustainability, or any climate change-related topics, using graphical aids can help you illustrate more data with less text and make your slides more dynamic and motivating. See how you can improve climate change presentations, whether you’re teaching, training, or inspiring your audience.

Visual illustrations can help clarify the message and ideas you want to convey. Using imagery to support rich data can help you take your environmental presentation to the next level and keep your listeners’ focus.

Check out this list of PowerPoint templates we put together. It can be a source of visual inspiration for your climate change presentations.

Transform your business presentations with our expert resources. Discover more on our business performance presentations webpage.

These seven decks will help you create high-quality presentations and illustrate various ecology and climate change-related topics:

• Actions against climate change
• Triple bottom line sustainable strategy
• Circular economy and sustainability
• Climate change impacts & business actions
• Plastic pollution & waste
• Ecology & green projects presentation
• Environmental and ecology icons

You can get any deck presented here as an editable file. Simply click on the images to see and download the source illustrations. Check the full collection of Climate & Ecology PowerPoint Templates here .

Actions Template Against Climate Change

Spreading knowledge and giving practical tips on what each of us can do to help slow down climate change and global warming is a very important part of combating this crisis.

If you want to explain the problems, go into the details. and show solution examples for a company, consumers, or employees, the climate change actions PPT deck is the one. It includes definitions, causes, and consequences of climate change, information on major sources of greenhouse emissions, practical action layouts, calendar and checklist slides, ESG principles, and many other diagrams.

You can use it to share knowledge, inspire, and motivate your community to be more conscious and effective in actions.

Check our blog to learn how visuals can help you drive climate change.

If you are an education professional or an NGO member, please contact us . We can give you a discount on our graphics or offer some of our presentations free of charge.

Triple Bottom Line Sustainable Business Strategy

The triple bottom line (TBL) is an accounting framework that incorporates three dimensions of business performance: social, environmental, and financial. Measuring business using TBL is one of the evaluation methodologies to verify how sustainable the business is, and how profitable it is.

The triple bottom line PowerPoint deck contains slides to illustrate the definition, metrics, quotes, and circular economy model. Also, you’ll find diagrams to show three areas of the TBL concept: Social Sustainability (People), Environmental Sustainability (Planet), and Economical Sustainability (Profit).

See how you can structure your TBL presentation and present various parts of it in this article . To learn more about accounting framework background, we recommend checking this Wikipedia article .

Circular Economy and Sustainability PPT Diagrams

The circular economy is a model of production & consumption. It involves sharing, reusing, repairing, and recycling materials and products for as long as possible. To present the essence of the circular economy and principles of the sustainable development model effectively, we encourage using visuals.

The circular economy PowerPoint template includes quotes slides, linear timelines, loop diagrams, comparison graphics, listings, processes, and layouts to show the difference between circular versus linear economies.

You can use these infographics in a broad spectrum of contexts to:

• Compare circular and linear economic models
• Show circular economy benefits
• Teach the green economy framework
• Design a lifecycle of a sustainable product
• Explain the 7R model principles with attractive graphics
• Create suggestive slides to emphasize the potential of a sustainable economy
• Give real-life examples of running a sustainable business

For more information about circular economy history and applications see this article .

If you’re talking about sustainability principles, types, or core pillars, see how icons can help translate abstract ideas into easy-to-read slides.

Climate Change Impacts & Business Actions Template

Explaining global warming effects or analyzing climate change risks? If you need to put together a general presentation on the climate change impacts and actions to be taken to combat it, have a look at the deck below.

Climate change impacts & business actions PPT deck contains diagrams for showing the impacts of global warming, facts, definitions, and quotes on climate from recognized institutions (UN, IPCC, NASA).

See simple design tips on improving your environmental presentation with visual examples.

Plastic Pollution & Waste PowerPoint Infographics

Plastic pollution has become one of the most pressing environmental issues. The rapidly increasing production of disposable plastic products influences the world’s ability to deal with them. The numbers are shocking: by 2050 there will be more plastic than fish in the ocean.

You can use plastic pollution & waste slides collection to illustrate the effects of plastic pollution, statistics of pollution and global waste, pollution contributors, actions we can take to tackle it and reduce plastic in our daily lives, and ways to increase employee engagement in recycling.

Graphics will help make the heavy data more user-friendly and it will be easier for you to persuade the audience you’re presenting to that steps and actions toward a more sustainable economy need to be taken now.

Creative Eco & Green Projects Presentation Template

Pitching your new green technology idea to investors or presenting an eco-project? Get inspired by the following visualizations in green theme to help you to convey your ideas in an out-of-the-box format.

Such slides with organic blob shape designs are easily associated with a natural and environmental style and will give your presentation a personal touch. You can use these layouts to illustrate any part of your presentation, such as the agenda, project team, vision & mission statements, problem & green solution, project development & implementation timelines, solutions benefits, roadmap calendar, and many more.

Ecology Icons Bundle for PowerPoint

You don’t necessarily need very complex graphics to make your presentation or another document look more professional and modern-looking. Start small: add icons to highlight your points better.

Ecology icons PPT bundle contains various symbols for illustrating natural resources, sustainable transport & architecture, green energy, waste industry (types, treatment, and prevention), and ecosystems concepts.

See creative ways to use icons in slide design to make it easier for the reader to remember the content.

Why use strong visuals for climate change presentations

Adding graphics, even simple ones, will definitely make a difference in your presentation. Therefore it will help you convey your ideas better. This especially concerns climate change presentations, because you probably want to motivate people to take action and better-presented information will help you connect with them.

Having a set of easily editable templates can make your work easier. Pre-designed graphics will help you save time and focus on presentation content.

To ensure the professional look of your slides, check our articles from our designer’s advice about graphical consistency rules  and  aligning elements  properly.

Check our YouTube movie with examples of how you can illustrate climate change or global warming concepts:

Resources: PowerPoint Templates to Use for Climate Change Presentations

The slide examples mentioned above can help you provide environmental education content, prepare marketing material, and kickstart a positive change for a sustainable future.

Explore the set of presentation graphics on climate change, global warming, and other connected topics:

Environmental & Climate Change Presentation PPT Templates

To try out how those graphics work, get a sample of  free PPT diagrams and icons . You can use it to see if this kind of presentation visuals is a good fit for you.

Climate Matters • November 25, 2020

New Presentation: Our Changing Climate

Key concepts:.

Climate Central unveils Our Changing Climate —an informative and customizable climate change presentation that meteorologists, journalists, and others can use for educational outreach and/or a personal Climate 101 tool.

The presentation follows a ”Simple, Serious, Solvable” framework, inspired by climate scientist Scott Denning. This allows the presenter to comfortably explain, and the viewers to easily understand, the causes (Simple), impacts (Serious), and solutions (Solvable) of climate change. 

Our Changing Climate is a revamped version of our 2016 climate presentation, and includes the following updates and features:

Up-to-date graphics and topics

Local data and graphics

Fully editable slides (add, remove, customize)

Presenter notes, background information, and references for each slide

Supplementary and bonus slides

Download Outline (PDF, 110KB)

Download Full Presentation (PPT, 148MB)

Updated: April 2021

Climate Central is presenting a new outreach and education resource for meteorologists, journalists, and others—a climate change presentation, Our Changing Climate . This 55-slide presentation is a guide through the basics of climate change, outlining its causes, impacts, and solutions. This climate change overview is unique because it includes an array of local graphics from our ever-expanding media library. By providing these local angles, the presenter can demonstrate that climate change is not only happening at a global-scale, but in our backyards.

This presentation was designed to support your climate change storytelling, but can also double as a great Climate 101 tool for journalists or educators who want to understand climate change better. Every slide contains main points along with background information, so people that are interested can learn at their own pace or utilize graphics for their own content. 

In addition to those features, it follows the “Simple, Serious, Solvable” framework inspired by Scott Denning, a climate scientist and professor of atmospheric science at Colorado State University (and a good friend of the program). These three S’s help create the presentation storyline and outline the causes (Simple), impacts (Serious), and solutions (Solvable) of climate change. 

Simple. It is simple—burning fossil fuels is heating up the Earth. This section outlines the well-understood science that goes back to the 1800s, presenting local and global evidence that our climate is warming due to human activities.

Serious. More extreme weather, rising sea levels, and increased health and economic risks—the consequences of climate change. In this section, well, we get serious. Climate change impacts are already being felt around the world, and they will continue to intensify until we cut greenhouse gas emissions. 

Solvable. With such a daunting crisis like climate change, it is easy to get wrapped up in the negative impacts. This section explains how we can curb climate change and lists the main pathways and solutions to achieving this goal. 

With the rollout of our new climate change presentation, we at Climate Central would value any feedback on this presentation. Feel free to reach out to us about how the presentation worked for you, how your audience reacted, or any ideas or topics you would like to see included. 

ACKNOWLEDGMENTS & SPECIAL THANKS

Climate Central would like to acknowledge Paul Gross at WDIV-TV in Detroit and the AMS Station Science Committee for the original version of the climate presentation, Climate Change Outreach Presentation , that was created in 2016. We would also like to give special thanks to Scott Denning, professor of atmospheric science at Colorado State University and a member of our NSF advisory board, for allowing us to use this “Simple, Serious, Solvable” framework in this presentation resource.

SUPPORTING MULTIMEDIA

4 climate topics we should be talking about

Which climate issues should be prioritized to create real impact? Image:  Pexels.

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• COP27 takes place in Egypt this month – urgent priorities include mitigation, adaptation, finance and collaboration.
• Here we focus on key topics which deserve more attention as we seek to find climate change solutions.
• Contributions from business leaders shine a light on what's needed to consolidate action.

This year’s UN Climate Conference COP27 takes place in Sharm el-Sheikh, 6-18 November, against a backdrop of turbulent global events: the war in Ukraine has sparked an energy crisis and we are experiencing more extreme weather events.

Last year's COP26 in Glasgow, marked five years since the Paris Agreement was signed, with its aim to keep global temperatures well below 2C above pre-industrial levels and to limit temperature increases to 1.5C.

Now, according to the UN's recent Emissions Gap Report , there is “no credible pathway to 1.5C in place”. This stark warning sets the tone for this year's climate summit.

With a vision to scale-up climate efforts and accelerate emissions reductions, the summit will focus on four central objectives: mitigation and reducing emissions; adaptation and enhancing resilience; the $100 billion promised by developed nations; and the urgent need for collaboration.

With that in mind, we've highlighted key climate issues – which aren't always given due consideration – but which should be prioritized to create real impact, including contributions from two business leaders.

1. Harnessing the power of the ocean

"five solutions can reduce greenhouse gas emissions by 20%".

We're not harnessing the true power of the ocean. Not only does the ocean offer solutions to reduce emissions and make a huge environmental impact, but we can also improve the health of this precious ecosystem.

Kristian Teleki, Director, Friends of Ocean Action, explains "There are five solutions that can reduce greenhouse gas emissions by 20% in order to get us to the 1.5C target those five solutions are: reducing emissions from maritime transport; nature-based solutions; shifting diets to eat more low carbon-intensive food from the ocean; offshore wind (or offshore renewable energy); and indeed storing carbon in the seabed."

The Blue Carbon Challenge is a key part of this effort to solve the climate crisis. Essentially, it's a global call for blue carbon initiatives (focused on mangrove, seagrass, marsh and seaweed) which could lead to carbon credits, and/or tools in finance, education and training that improve trust and transparency in the blue carbon market.

There's a huge opportunity to prioritise projects that benefit indigenous, local communities and biodiversity. The solutions exist but we need to focus our energies on making change happen now, before it's too late.

2. Women as climate leaders

"we have to start valuing, community-based knowledge and traditional ecological knowledge".

Climate change is unequivocally a threat to all humanity but not everyone is affected or at risk to the same extent. Women are 14 times more likely to die in a climate-rated disaster than men. Those living in low and middle-income countries bear the brunt of caring responsibilities, looking after children and elderly relatives, in incredibly challenging conditions.

Kahea Pacheco, co-executive director of the Women's Earth Alliance , says "They are often tasked with finding food and providing energy for cooking and all of those things become worse and become harder to do when dealing with climate impacts and when dealing with environmental justice."

Too often these women are ignored but they are uniquely positioned to contribute to solutions that work best for their communities. They understand better than anyone what could make a real difference and offer a fresh perspective on how to achieve meaningful impact.

Pacheco explains, "We have to start valuing, community-based knowledge and traditional ecological knowledge on the same playing field as we value Western knowledge and science. Because I think there's a power dynamic there. And I think that not valuing it equally is one of the reasons that entities don't think to partner with communities first and foremost."

Have you read?

7 leaders share what's needed now for climate action ahead of cop27, cop27: why it matters and 5 key areas for action, true success at cop27 means addressing climate justice — here's how to do it, 3. africa has a pivotal role to play, "africa must chart its sustainability ambitions at cop27".

Caroline Parker, Managing Director, Strategic Communications, FTI Consulting South Africa

Dr. Martin Porter, Senior Advisor for Sustainability at FTI Consulting and Executive Chair, Cambridge Institute of Sustainability Leadership, Brussels

African nations must use COP27 to present a united vision of their transition path to a climate neutral, sustainable continent that ensures its economies and people are central to potential solutions. This requires building resilience and being compensated fairly for loss or damage, whilst benefitting from economic and social opportunities.

Three important threads inform policy adoption for Africa. First, policy transformation must act as a catalyst for progress and change. Secondly, policy harmonisation will facilitate intra-Africa cooperation and regional integration that positions it more powerfully on the world stage.

Finally, optimising global cooperation and partnerships such as with the EU will create initiatives and common agendas based on shared interest. The EU is working to include sustainability considerations into every aspect of finance and support tangible ESG business transformations to attract investors. Investment policies adopted by our own financial institutions must be conducive towards climate change and climate neutrality, while supporting Africa’s just transition.

These steps will help create policy certainty required to secure capital flows to build new sectors while transitioning to a sustainable economy. Robust governance aligned with global standards will be critical, while Africa must not be disadvantaged by principles and frameworks adopted elsewhere in the world.

Climate change poses an urgent threat demanding decisive action. Communities around the world are already experiencing increased climate impacts, from droughts to floods to rising seas. The World Economic Forum's Global Risks Report continues to rank these environmental threats at the top of the list.

To limit global temperature rise to well below 2°C and as close as possible to 1.5°C above pre-industrial levels, it is essential that businesses, policy-makers, and civil society advance comprehensive near- and long-term climate actions in line with the goals of the Paris Agreement on climate change.

The World Economic Forum's Climate Initiative supports the scaling and acceleration of global climate action through public and private-sector collaboration. The Initiative works across several workstreams to develop and implement inclusive and ambitious solutions.

This includes the Alliance of CEO Climate Leaders, a global network of business leaders from various industries developing cost-effective solutions to transitioning to a low-carbon, climate-resilient economy. CEOs use their position and influence with policy-makers and corporate partners to accelerate the transition and realize the economic benefits of delivering a safer climate.

Contact us to get involved.

4. Climate 2.0: c limate adaptation is key

"recognizing the dual opportunity of climate adaptation and mitigation".

Peter Herweck, CEO, AVEVA

At COP27, business leaders have an unprecedented opportunity to support accelerating access to clean, affordable and reliable energy for all as part of the solution to current crises. Setting and realizing ambitious decarbonization commitments continues to present an important source of economic opportunity for many businesses and communities.

For example, McKinsey projects growing demand for net-zero offerings can create new value pools, across infrastructure, transport, energy, power and buildings worth more than $12 trillion of annual sales by 2030.

Notwithstanding unwavering commitment to mitigation, it is important to recognize that we are already seeing devastating impacts from climate change across the globe. This includes in African continent, which is responsible for less than 4% of global CO2 emissions but pays one of the highest prices for global warming.

It is time for industry to step up and recognize that adaptation also provides significant opportunity and that we do not need to start from scratch to support its realization. Applying lessons learned from our net-zero journeys, using our business mindset and growing digital tools, we can identify a path forward, and build the collaboration we need to take us to a more equitable, resilient and sustainable future. Are you with us?

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What is Climate Change? PowerPoint Presentation

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Simpler Presentations of Climate Change

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Science Leads the Future

Are We Entering The Golden Age Of Climate Modeling?

Alumni push universities forward on climate, indoor air pollution in the time of coronavirus, how an unlikely friendship upended permafrost myths, the alarming rise of predatory conferences, science leads the future, and the future is now.

Has this happened to you? You are presenting the latest research about climate change to a general audience, maybe at the town library, to a local journalist, or even in an introductory science class. After presenting the solid science about greenhouse gases, how they work, and how we are changing them, you conclude with “and this is what the models predict about our climate future…”

At that point, your audience may feel they are being asked to make a leap of faith. Having no idea how the models work or what they contain and leave out, this final and crucial step becomes to them a “trust me” moment. Trust me moments can be easy to deny.

This problem has not been made easier by a recent expansion in the number of models and the range of predictions presented in the literature. One recent study making this point is that of Hausfather et al. [2022], which presents the “hot model” problem: the fact that some of the newer models in the Coupled Model Intercomparison Project Phase 6 (CMIP6) model comparison yield predictions of global temperatures that are above the range presented in the Intergovernmental Panel on Climate Change’s (IPCC) Sixth Assessment Report (AR6). The authors present a number of reasons for, and solutions to, the hot model problem.

Models are crucial in advancing any field of science. They represent a state-of-the-art summary of what the community understands about its subject. Differences among models highlight unknowns on which new research can be focused.

But Hausfather and colleagues make another point: As questions are answered and models evolve, they should also converge. That is, they should not only reproduce past measurements, but they should also begin to produce similar projections into the future. When that does not happen, it can make trust me moments even less convincing.

Are there simpler ways to make the major points about climate change, especially to general audiences, without relying on complex models?

We think there are.

Old Predictions That Still Hold True

In a recent article in Eos , Andrei Lapenis retells the story of Mikhail Budyko ’s 1972 predictions about global temperature and sea ice extent [ Budyko , 1972]. Lapenis notes that those predictions have proven to be remarkably accurate. This is a good example of effective, long-term predictions of climate change that are based on simple physical mechanisms that are relatively easy to explain.

There are many other examples that go back more than a century. These simpler formulations don’t attempt to capture the spatial or temporal detail of the full models, but their success at predicting the overall influence of rising carbon dioxide (CO 2 ) on global temperatures makes them a still-relevant, albeit mostly overlooked, resource in climate communication and even climate prediction.

One way to make use of this historical record is to present the relative consistency over time in estimates of equilibrium carbon sensitivity (ECS), the predicted change in mean global temperature expected from a doubling of atmospheric CO 2 . ECS can be presented in straightforward language, maybe even without the name and acronym, and is an understandable concept.

Estimates of ECS can be traced back for more than a century (Table 1), showing that the relationship between CO 2 in the atmosphere and Earth’s radiation and heat balance, as an expression of a simple and straightforward physical process, has been understood for a very long time. We can now measure that balance with precision [e.g., Loeb et al. , 2021], and measurements and modeling using improved technological expertise have all affirmed this scientific consistency.

Table 1. Selected Historical Estimates of Equilibrium Carbon Sensitivity (ECS)

Settled Science

Another approach for communicating with general audiences is to present an abbreviated history demonstrating that we have known the essentials of climate change for a very long time—that the basics are settled science.

The following list is a vastly oversimplified set of four milestones in the history of climate science that we have found to be effective. In a presentation setting, this four-step outline also provides a platform for a more detailed discussion if an audience wants to go there.

• 1850s: Eunice Foote observes that, when warmed by sunlight, a cylinder filled with CO 2 attained higher temperatures and cooled more slowly than one filled with ambient air, leading her to conclude that higher concentrations of CO 2 in the atmosphere should increase Earth’s surface temperature [ Foote , 1856]. While not identifying the greenhouse effect mechanism, this may be the first statement in the scientific literature linking CO 2 to global temperature. Three years later, John Tyndall separately develops a method for measuring the absorbance of infrared radiation and demonstrates that CO 2 is an effective absorber (acts as a greenhouse gas) [ Tyndall , 1859 ; 1861 ]. 
• 1908: Svante Arrhenius describes a nonlinear response to increased CO 2 based on a year of excruciating hand calculations actually performed in 1896 [ Arrhenius , 1896]. His value for ECS is 4°C (Table 1), and the nonlinear response has been summarized in a simple one-parameter model .
• 1958: Charles Keeling establishes an observatory on Mauna Loa in Hawaii. He begins to construct the “ Keeling curve ” based on measurements of atmospheric CO 2 concentration over time. It is amazing how few people in any audience will have seen this curve.
• Current: The GISS data set of global mean temperature from NASA’s Goddard Institute for Space Studies records the trajectory of change going back decades to centuries using both direct measurements and environmental proxies.

The last three of these steps can be combined graphically to show how well the simple relationship derived from Arrhenius ’s [1908] projections, driven by CO 2 data from the Keeling curve, predicts the modern trend in global average temperature (Figure 1). The average error in this prediction is only 0.081°C, or 8.1 hundredths of a degree.

A surprise to us was that this relationship can be made even more precise by adding the El Niño index (November–January (NDJ) from the previous year) as a second predictor. The status of the El Niño–Southern Oscillation ( ENSO ) system has been known to affect global mean temperature as well as regional weather patterns. With this second term added , the average error in the prediction drops to just over 0.06°C, or 6 one hundredths of a degree.

It is also possible to extend this simple analysis into the future using the same relationship and IPCC AR6 projections for CO 2 and “assessed warming” (results from four scenarios combined; Figure 2).

Although CO 2 is certainly not the only cause of increased warming, it provides a powerful index of the cumulative changes we are making to Earth’s climate system.

A presentation built around the consistency of equilibrium carbon sensitivity estimates does not deliver a complete understanding of the changes we are causing in the climate system, but the relatively simple, long-term historical perspective can be an effective way to tell the story.

In this regard, it is interesting that the “Summary for Policy Makers” [ Intergovernmental Panel on Climate Change , 2021] from the most recent IPCC science report also includes a figure (Figure SPM.10, p. 28) that captures both measured past and predicted future global temperature change as a function of cumulative CO 2 emissions alone. Given that the fraction of emissions remaining in the atmosphere over time has been relatively constant, this is equivalent to the relationship with concentration presented here. That figure also presents the variation among the models in predicted future temperatures, which is much greater than the measurement errors in the GISS and Keeling data sets that underlie the relationship in Figure 1.

A presentation built around the consistency of ECS estimates and the four steps clearly does not deliver a complete understanding of the changes we are causing in the climate system, but the relatively simple, long-term historical perspective can be an effective way to tell the story of those changes.

Past Performance and Future Results

Projecting the simple model used in Figure 1 into the future (Figure 2) assumes that the same factors that have made CO 2 alone such a good index to climate change to date will remain in place. But we know there are processes at work in the world that could break this relationship.

For example, some sources now see the electrification of the economic system, including transportation, production, and space heating and cooling, as part of the path to a zero-carbon economy [e.g., Gates , 2021]. But there is one major economic sector in which energy production is not the dominant process for greenhouse gas emissions and carbon dioxide is not the major greenhouse gas. That sector is agriculture.

The U.S. Department of Agriculture has estimated that agriculture currently accounts for about 10% of total U.S. greenhouse gas emissions, with nitrous oxide (N 2 O) and methane (CH 4 ) being major contributors to that total. According to the EPA (Figure 3), agriculture contributes 79% of N 2 O emissions in the United States, largely from the production and application of fertilizers (agricultural soil management) as well as from manure management, and 36% of CH 4 emissions (enteric fermentation and manure management—one might add some of the landfill emissions to that total as well).

If we succeed in moving nonagricultural sectors of the economy toward a zero-carbon state, the relationship in Figures 1 and 2 will be broken. The rate of overall climate warming would be reduced significantly, but N 2 O and CH 4 would begin to play a more dominant role in driving continued greenhouse gas warming of the planet, and we will then need more complex models than the one used for Figures 1 and 2. But just how complex?

In his recent book Life Is Simple , biologist Johnjoe McFadden traces the influence across the centuries of William of Occam (~1287–1347) and Occam’s razor as a concept in the development of our physical understanding of everything from the cosmos to the subatomic structure of matter [ McFadden , 2021]. One simple statement of Occam’s razor is, Entities should not be multiplied without necessity.

This is a simple and powerful statement: Explain a set of measurements with as few parameters, or entities, as possible. But the definition of necessity can change when the goals of a model or presentation change. The simple model used in Figures 1 and 2 tells us nothing about tomorrow’s weather or the rate of sea level rise or the rate of glacial melt. But for as long as the relationship serves to capture the role of CO 2 as an accurate index of changes in mean global temperature, it can serve the goal of making plain to general audiences that there are solid, undeniable scientific reasons why climate change is happening.

Getting the Message Across

When and if the simple relationship derived from Arrhenius’s calculations does fail as an accurate index of changes in mean global temperature, it will still provide a useful platform for explaining what has happened and why.

If we move toward an electrified economy and toward zero-carbon sources of electricity, the simple relationship derived from Arrhenius’s calculations will no longer serve that function. But when and if it does fail, it will still provide a useful platform for explaining what has happened and why. Perhaps there will be another, slightly more complex model for predicting and explaining climate change that involves three gases.

No matter how our climate future evolves, simpler and more accessible presentations of climate change science will always rely on and begin with our current understanding of the climate system. Complex, detailed models will be central to predicting our climate future (Figure 2 here would not be possible without them), but we will be more effective communicators if we can discern how best to simplify that complexity when presenting the essentials of climate science to general audiences.

Arrhenius, S. (1896), On the influence of carbonic acid in the air upon temperature of the ground, Philos. Mag. J. Sci. , Ser. 5 , 41 , 237–276, https://doi.org/10.1080/14786449608620846 .

Arrhenius, S. (1908), Worlds in the Making: The Evolution of the Universe , translated by H. Borns, 228 pp., Harper, New York.

Budyko, M. I. (1972), Man’s Impact on Climate [in Russian], Gidrometeoizdat, St. Petersburg, Russia.

Foote, E. (1856), Circumstances affecting the heat of the Sun’s rays,  Am. J. Sci. Arts ,  22 (66), 382–383,  ia800802.us.archive.org/4/items/mobot31753002152491/mobot31753002152491.pdf .

Gates, B. (2021), How to Avoid a Climate Disaster , 257 pp., Alfred A. Knopf, New York.

Hausfather, Z., et al. (2022), Climate simulations: Recognize the ‘hot model’ problem, Nature , 605 , 26–29, https://doi.org/10.1038/d41586-022-01192-2 .

Intergovernmental Panel on Climate Change (2021), Summary for policymakers, in Climate Change 2021: The Physical Science Basis—Contribution of Working Group I to the Sixth Assessment Report of the Intergovernmental Panel on Climate Change , edited by V. Masson-Delmotte et al., pp. 3–32, Cambridge Univ. Press, Cambridge, U.K., and New York, https://www.ipcc.ch/report/ar6/wg1/downloads/report/IPCC_AR6_WGI_SPM.pdf .

Loeb, N. G., et al. (2021), Satellite and ocean data reveal marked increase in Earth’s heating rate, Geophys. Res. Lett. , 48 (13), e2021GL093047, https://doi.org/10.1029/2021GL093047 .

McFadden, J. (2021), Life Is Simple: How Occam’s Razor Set Science Free and Shapes the Universe , 376 pp., Basic Books, New York.

Tyndall, J. (1859), Note on the transmission of radiant heat through gaseous bodies,  Proc. R. Soc. London ,  10 , 37–39,  https://www.jstor.org/stable/111604 . 

Tyndall, J. (1861), I. The Bakerian Lecture.—On the absorption and radiation of heat by gases and vapours, and on the physical connexion of radiation, absorption, and conduction, Philos. Trans. R. Soc. London , 151 , https://doi.org/10.1098/rstl.1861.0001 .

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John Aber ( [email protected] ) and Scott V. Ollinger, Department of Natural Resources and the Environment and the Institute for the Study of Earth, Oceans, and Space, University of New Hampshire, Durham

Update, 26 September 2022: This article has been updated to include the early contribution of Eunice Foote in the study of CO 2 and its effects on Earth’s climate.

Citation:  Aber, J., and S. V. Ollinger (2022), Simpler presentations of climate change,  Eos, 103, https://doi.org/10.1029/2022EO220444 . Published on 13 September 2022.

Text © 2022. the authors.  cc by-nc-nd 3.0 except where otherwise noted, images are subject to copyright. any reuse without express permission from the copyright owner is prohibited., features from agu publications, tiny satellites can provide significant information about space, a powerful new model for u.s. climate–air quality interactions, introducing the new editor-in-chief of jgr: planets.

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Top 100 Climate Change Topics To Write About

Climate change issues have continued to increase over the years. That’s because human activities like fossil fuel usage, excavation, and greenhouse emissions continue to drastically change the climate negatively. For instance, burning fossil fuels continues to release greenhouse emissions and carbon dioxide in large quantities. And the lower atmosphere of the earth traps these gasses thereby affecting the global climate. To enhance their awareness of the impact of global warming, educators ask learners to write academic papers and essays on different climate change topics.

According to statistics, global warming affects the climate in different ways. However, the earth has experienced a general temperature increase of 0.85 degrees centigrade over the last 100 years. Such statistics show that this increase will eventually pass the acceptable thresholds in the next 10 years or less. And this will have dire consequences on human health and the global climate. As such, writing a paper about a topic on climate change is a great way to educate the masses.

However, some learners have difficulties choosing topics for their papers and essays on climate change. That’s because this is a relatively new subject. Nevertheless, students that are pursuing ecology, political, and biology studies are conversant with this subject. If struggling to decide what to write about, consider this list of topics related to climate change.

Climate Change Topics for Short Essays

Perhaps, your educator has asked you to write a short essay on climate change. Maybe you’re yet to decide what to write about because every topic you think about seems to have been written about. In that case, use this list of climate change topics for inspiration. You can write about one of these topics or develop it to make it more unique.

• How climate change is responsible for the disappearing rainforest
• The effects of global warming on air quality within the urban areas
• Global warming and greenhouse emissions- Possible health risks
• Is climate change responsible for irregular weather patterns?
• How has climate change affected the food chain?
• The negative effects of climate change on human wellbeing
• How global warming affects agriculture
• How climate change works
• Why is climate change dangerous to human health?
• How to minimize global warming effects on human health
• How global warming affects the healthcare
• Effects of climate change of life quality in rural and urban areas
• How warmer temperatures support allergy-related illnesses
• How climate change is a risk to life on earth
• How climate change and natural disasters correlate
• How climate change affects the population of the earth
• How climate change relates to global warming
• How global warming has caused extreme heating in most urban areas
• How wildfires relate to climate change
• How ocean acidification and climate change affect the world’s habitat

These climate change essay topics cover different aspects of human activities and their effects on the earth’s ecosystem. As such, writing a research paper or essay on any of these topics requires extensive research and analysis of information. That’s the only way you can come up with a solid paper that will impress the educator to award you the top grade.

Climate Change Issues that Make for Good Topics

Maybe you want to research issues that relate to climate change. Most people may have not considered such issues but they are worthy of climate change debate topics. In that case, consider these issues when choosing your climate topics for papers and essays.

• Climate change and threat to natural biodiversity are equally important
• Climate change in Miami and Saudi Arabia- How the effects compare
• Climate change as a human activity’s effect on the environment
• Preventing climate change by protecting forests
• Climate change in China- How the country has declined to head to the global call about saving Mother Nature
• Common causes of climate change
• Common effects of climate change
• The definition of climate change
• What is anthropogenic climate change
• Describe climate change
• What drives climate change?
• Renewable energy sources and climate change
• Human and economics induced climate change
• Climate change biology
• Climate change and business
• Science, Spin, and climate change
• Climate change- How global warming affects populations
• Climate change and social concepts
• Extreme weather and climate change- How they relate
• Global warming as a complex issue in climate change

These are great climate change topics for research papers and essays. However, writing about these topics requires extensive research. You should also be ready to spend energy and time finding relevant and latest sources of information before you write about these topics.

Interesting Climate Change Topics for Papers and Essays

Perhaps, you want to write an essay or paper about something interesting. In that case, consider this list of interesting climate change research paper topics.

• Climate change across the globe- What experts say
• Development, climate change, and disaster reduction
• Critical review- Climate change and agriculture
• Schools should include climate change as a subject in geography courses
• Consumption and climate change- How the wind blows in Indiana
• How the United Nations responds to climate change
• Snowpack and climate change
• How climate change threatens global security
• The effects of climate change on coastal areas’ tourism
• How climate change relates to Queensland Australia’s floods
• How climate change affects the tourism and hospitality industry
• Possible strategies for addressing the effects of climate change on urban areas
• How climate change affects indigenous people
• How to avoid the threats of climate change
• How climate change affects coral triangle turtles
• Climate change drivers in the Asian countries
• Economic discourse analysis methodology in climate change
• How climate change affects New Hampshire businesses
• How climate change affects the life of an individual
• The economic cost of the effects of climate change

These are fantastic climate change paper topics to explore. Nevertheless, you must be ready to research your topic extensively before you start writing your academic paper or essay.

Major Topics on Climate Change for Academic Writing

Perhaps, you’re looking for topics related to climate change that you write major papers about. In that case, you should consider these global climate change topics.

• Early science on climate change
• How the world can manage the effects of climate change
• Environmental issues relating to climate change
• Views comparison about the climate change problem
• Asset-based community development and climate change
• Experts’ evaluation of climate change
• How science affects climate change
• How climate change affects the ocean life
• Scotland’s vulnerability to climate change
• How energy conservation can solve the climate change problem
• How climate change affects the world economy
• International collaboration and climate change
• International relations view on climate change
•  How transportation affects climate change
• Climate change and technology
• Climate change policies and human rights
• Climate change from an anthropological perspective
• Climate change as an international security issue
• Role of the United Nations in addressing climate change
• Climate change and pollution

This category has some of the best climate change thesis topics. That’s because most people will be interested in reading papers on such topics due to their global perspectives. Nevertheless, you should prepare to spend a significant amount of time researching and writing about any of these topics on climate change.

Climate Change Topics for Presentation

Perhaps, you want to write papers on topics related to climate change for presentation purposes. In that case, you need topics that most people can resonate with. Here is a list of topics about climate change that will interest most people.

• How can humans stop global warming in the next ten years
• Could humans have stopped global warming a decade ago?
• How has the environment changed over the years and how has this change caused global warming?
• How did the Obama administration try to limit climate change?
• What is the influence of chemical engineering on global warming?
• How is urbanization connected to climate change?
• Theories that explain why some nations ignore climate change
• How global warming affects the rising sea levels
• How anthropogenic and natural climate change differ
• How the war against terrorism differs from the war on climate change
• How atmospheric change influences global climate change
• Negative effects of global climate change on Minnesota
• The greenhouse effect and ozone depletion
• How greenhouse affects the earth’s environment
• How can individuals reduce the emissions of greenhouse gasses
• How climate change will affect humans in their lifetime
• What are the social, physical, and economic effects of climate change
• Problems and solutions to climate change on the Pacific Ocean
• How climate change relates to species’ extinction
• How the phenomenon of denying climate change affects animals

This list prepared by our  research helpers has some of the best essay topics on climate change. Pick one of these ideas, research it, and then compose a winning paper.

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What Is Climate Change?

Climate change is a long-term change in the average weather patterns that have come to define Earth’s local, regional and global climates. These changes have a broad range of observed effects that are synonymous with the term.

Changes observed in Earth’s climate since the mid-20th century are driven by human activities, particularly fossil fuel burning, which increases heat-trapping greenhouse gas levels in Earth’s atmosphere, raising Earth’s average surface temperature. Natural processes, which have been overwhelmed by human activities, can also contribute to climate change, including internal variability (e.g., cyclical ocean patterns like El Niño, La Niña and the Pacific Decadal Oscillation) and external forcings (e.g., volcanic activity, changes in the Sun’s energy output , variations in Earth’s orbit ).

Scientists use observations from the ground, air, and space, along with computer models , to monitor and study past, present, and future climate change. Climate data records provide evidence of climate change key indicators, such as global land and ocean temperature increases; rising sea levels; ice loss at Earth’s poles and in mountain glaciers; frequency and severity changes in extreme weather such as hurricanes, heatwaves, wildfires, droughts, floods, and precipitation; and cloud and vegetation cover changes.

“Climate change” and “global warming” are often used interchangeably but have distinct meanings. Similarly, the terms "weather" and "climate" are sometimes confused, though they refer to events with broadly different spatial- and timescales.

What Is Global Warming?

Global warming is the long-term heating of Earth’s surface observed since the pre-industrial period (between 1850 and 1900) due to human activities, primarily fossil fuel burning, which increases heat-trapping greenhouse gas levels in Earth’s atmosphere. This term is not interchangeable with the term "climate change."

Since the pre-industrial period, human activities are estimated to have increased Earth’s global average temperature by about 1 degree Celsius (1.8 degrees Fahrenheit), a number that is currently increasing by more than 0.2 degrees Celsius (0.36 degrees Fahrenheit) per decade. The current warming trend is unequivocally the result of human activity since the 1950s and is proceeding at an unprecedented rate over millennia.

Weather vs. Climate

“if you don’t like the weather in new england, just wait a few minutes.” - mark twain.

Weather refers to atmospheric conditions that occur locally over short periods of time—from minutes to hours or days. Familiar examples include rain, snow, clouds, winds, floods, or thunderstorms.

Climate, on the other hand, refers to the long-term (usually at least 30 years) regional or even global average of temperature, humidity, and rainfall patterns over seasons, years, or decades.

Find Out More: A Guide to NASA’s Global Climate Change Website

This website provides a high-level overview of some of the known causes, effects and indications of global climate change:

Evidence. Brief descriptions of some of the key scientific observations that our planet is undergoing abrupt climate change.

Causes. A concise discussion of the primary climate change causes on our planet.

Effects. A look at some of the likely future effects of climate change, including U.S. regional effects.

Vital Signs. Graphs and animated time series showing real-time climate change data, including atmospheric carbon dioxide, global temperature, sea ice extent, and ice sheet volume.

Earth Minute. This fun video series explains various Earth science topics, including some climate change topics.

Other NASA Resources

Goddard Scientific Visualization Studio. An extensive collection of animated climate change and Earth science visualizations.

Sea Level Change Portal. NASA's portal for an in-depth look at the science behind sea level change.

NASA’s Earth Observatory. Satellite imagery, feature articles and scientific information about our home planet, with a focus on Earth’s climate and environmental change.

Header image is of Apusiaajik Glacier, and was taken near Kulusuk, Greenland, on Aug. 26, 2018, during NASA's Oceans Melting Greenland (OMG) field operations. Learn more here . Credit: NASA/JPL-Caltech

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• 9 questions about climate change you were too embarrassed to ask

Basic answers to basic questions about global warming and the future climate.

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This explainer was updated by Umair Irfan in December 2018 and draws heavily from a card stack written by Brad Plumer in 2015. Brian Resnick contributed the section on the Paris climate accord in 2017.

There’s a vast and growing gap between the urgency to fight climate change and the policies needed to combat it.

In 2018, the United Nations’ Intergovernmental Panel on Climate Change found that it is possible to limit global warming to 1.5 degrees Celsius this century, but the world may have as little as 12 years left to act. The US government’s National Climate Assessment , with input from NASA, the Environmental Protection Agency, and the Pentagon, also reported that the consequences of climate change are already here, ranging from nuisance flooding to the spread of mosquito-borne viruses into what were once colder climates. Left unchecked, warming will cost the US economy hundreds of billions of dollars.

However, these facts have failed to register with the Trump administration, which is actively pushing policies that will increase the emissions of heat-trapping gases.

Ever since he took office, President Donald Trump has rejected or undermined President Barack Obama’s signature climate achievements: the Paris climate agreement; the Clean Power Plan , the main domestic policy for limiting greenhouse gas emissions; and fuel economy standards , which target transportation, the largest US source of greenhouse gases.

At the same time, the Trump administration has aggressively boosted fossil fuels: opening unprecedented swaths of public lands to mining and drilling , attempting to bail out foundering coal power plants , and promoting hydrocarbon exploitation at climate change conferences .

Trump has also appointed climate change skeptics to key positions. Quietly, officials at these and other science agencies have been removing the words “climate change” from government websites and press releases.

Yet the evidence for humanity’s role in changing the climate continues to mount, and its consequences are increasingly difficult to ignore. Atmospheric carbon dioxide concentrations now top 408 parts per million, a threshold the planet hasn’t seen in millions of years . Greenhouse gas emissions reached a record high in 2018. Disasters worsened by climate change have taken hundreds of lives, destroyed thousands of homes, and cost billions of dollars.

The big questions now are how these ongoing changes in the climate will reverberate throughout the rest of the world, and what we should do about them. The answers bridge decades of research across geology, economics, and social science, which have been confounded by uncertainty and obscured by jargon. That’s why it can be a bit daunting to join the discussion for the first time, or to revisit the conversation after a hiatus.

To help, we’ve provided answers to some fundamental questions about climate change you may have been afraid to ask.

1) What is global warming?

In short: The world is getting hotter, and humans are responsible.

Yes, the planet’s temperature has changed before, but it’s the rise in average temperature of the Earth's climate system since the late 19th century, the dawn of the Industrial Revolution, that’s important here. Temperatures over land and ocean have gone up 0.8° to 1° Celsius (1.4° to 1.8° Fahrenheit), on average, in that span:

Many people use the term “climate change” to describe this rise in temperatures and the associated effects on the Earth's climate. (The shift from the term “global warming” to “climate change” was also part of a deliberate messaging effort by a Republican pollster to undermine support for environmental regulations.)

Like detectives solving a murder, climate scientists have found humanity’s fingerprints all over the planet’s warming, with the overwhelming majority of the evidence pointing to the extra greenhouse gases humans have put into the atmosphere by burning fossil fuels. Greenhouse gases like carbon dioxide trap heat at the Earth’s surface, preventing that heat from escaping back out into space too quickly. When we burn coal, natural gas, or oil for energy, or when we cut down forests that usually soak up greenhouse gases, we add even more carbon dioxide to the atmosphere, so the planet warms up.

Global warming also refers to what scientists think will happen in the future if humans keep adding greenhouse gases to the atmosphere.

Though there is a steady stream of new studies on climate change, one of the most robust aggregations of the science remains the Intergovernmental Panel on Climate Change’s fifth assessment report from 2013. The IPCC is convened by the United Nations, and the report draws on more than 800 expert authors. It projects that temperatures could rise at least 2°C (3.6°F) by the end of the century under many plausible scenarios — and possibly 4°C or more. A more recent study by scientists in the United Kingdom found a narrower range of expected temperatures if atmospheric carbon dioxide doubled, rising between 2.2°C and 3.4°C.

Many experts consider 2°C of warming to be unacceptably high , increasing the risk of deadly heat waves, droughts, flooding, and extinctions. Rising temperatures will drive up global sea levels as the world’s glaciers and ice sheets melt. Further global warming could affect everything from our ability to grow food to the spread of disease.

That’s why the IPCC put out another report in 2018 comparing 2°C of warming to a scenario with 1.5°C of warming . The researchers found that this half-degree difference is actually pretty important, since every bit of warming matters. Between the two outlooks, less warming means fewer people will have to move from coastal areas, natural weather events will be less severe, and economies will take a smaller hit.

However, limiting warming would likely require a complete overhaul of our energy system. Fossil fuels currently provide just over 80 percent of the world’s energy. To zero out emissions this century, we’d have to replace most of that with low-carbon sources like wind, solar, nuclear, geothermal, or carbon capture.

Beyond that, we may have to electrify everything that uses energy and start pulling greenhouse gases straight from the air. And to get on track for 1.5°C of warming, the world would have to halve greenhouse gas emissions from current levels by 2030.

That’s a staggering task, and there are huge technological and political hurdles standing in the way. As such, the world's nations have been slow to act on global warming — many of the existing targets for curbing greenhouse gas emissions are too weak , yet many countries are falling short of even these modest goals.

2) How do we know global warming is real?

The simplest way is through temperature measurements. Agencies in the United States, Europe, and Japan have independently analyzed historical temperature data and reached the same conclusion: The Earth’s average surface temperature has risen roughly 0.8° Celsius (1.4° Fahrenheit) since the early 20th century.

But that’s not the only clue. Scientists have also noted that glaciers and ice sheets around the world are melting. Satellite observations since the 1970s have shown warming in the lower atmosphere. There’s more heat in the ocean, causing water to expand and sea levels to rise. Plants are flowering earlier in many parts of the world. There’s more humidity in the atmosphere. Here’s a summary from the National Oceanic and Atmospheric Administration:

These are all signs that the Earth really is getting warmer — and that it’s not just a glitch in the thermometers. That explains why climate scientists say things like , “Warming in the climate system is unequivocal.” They’re really confident about this one.

3) How do we know humans are causing global warming?

Climate scientists say they are more than 95 percent certain that human influence has been the dominant cause of global warming since 1950. They’re about as sure of this as they are that cigarette smoke causes cancer.

Why are they so confident? In part because they have a good grasp of how greenhouse gases can warm the planet, in part because the theory fits the available evidence, and in part because alternate theories have been ruled out. Let's break it down in six steps:

1) Scientists have long known that greenhouse gases in the atmosphere — such as carbon dioxide, methane, or water vapor — absorb certain frequencies of infrared radiation and scatter them back toward the Earth. These gases essentially prevent heat from escaping too quickly back into space, trapping that radiation at the surface and keeping the planet warm.

2) Climate scientists also know that concentrations of greenhouse gases in the atmosphere have grown significantly since the Industrial Revolution. Carbon dioxide has risen 45 percent . Methane has risen more than 200 percent . Through some relatively straightforward chemistry and physics , scientists can trace these increases to human activities like burning oil, gas, and coal.

3) So it stands to reason that more greenhouse gases would lead to more heat. And indeed, satellite measurements have shown that less infrared radiation is escaping out into space over time and instead returning to the Earth’s surface. That’s strong evidence that the greenhouse effect is increasing.

4) There are other human fingerprints that suggest increased greenhouse gases are warming the planet. For instance, back in the 1960s, simple climate models predicted that global warming caused by more carbon dioxide would lead to cooling in the upper atmosphere (because the heat is getting trapped at the surface). Later satellite measurements confirmed exactly that . Here are a few other similar predictions that have also been confirmed.

5) Meanwhile, climate scientists have ruled out other explanations for the rise in average temperatures over the past century. To take one example: Solar activity can shift from year to year, affecting the Earth's climate. But satellite data shows that total solar irradiance has declined slightly in the past 35 years, even as the Earth has warmed.

6) More recent calculations have shown that it’s impossible to explain the temperature rise we’ve seen in the past century without taking the increase in carbon dioxide and other greenhouse gases into account. Natural causes, like the sun or volcanoes, have an influence, but they’re not sufficient by themselves.

Ultimately, the Intergovernmental Panel on Climate Change concluded that most of the warming since 1951 has been due to human activities. The Earth’s climate can certainly fluctuate from year to year due to natural forces (including oscillations in the Pacific Ocean, such as El Niño ). But greenhouse gases are driving the larger upward trend in temperatures.

And as the Climate Science Special Report , released by 13 US federal agencies in November 2017, put it, “For the warming over the last century, there is no convincing alternative explanation supported by the extent of the observational evidence.”

More: This chart breaks down all the different factors affecting the Earth’s average temperature. And there’s much more detail in the IPCC’s report , particularly this section and this one .

4) How has global warming affected the world so far?

Here’s a list of ongoing changes that climate scientists have concluded are likely linked to global warming, as detailed by the IPCC here and here .

Higher temperatures: Every continent has warmed substantially since the 1950s. There are more hot days and fewer cold days, on average, and the hot days are hotter.

Heavier storms and floods : The world’s atmosphere can hold more moisture as it warms. As a result, the overall number of heavier storms has increased since the mid-20th century, particularly in North America and Europe (though there’s plenty of regional variation). Scientists reported in December that at least 18 percent of Hurricane Harvey’s record-setting rainfall over Houston in August was due to climate change.

Heat waves: Heat waves have become longer and more frequent around the world over the past 50 years, particularly in Europe, Asia, and Australia.

Shrinking sea ice: The extent of sea ice in the Arctic, always at its maximum in winter, has shrunk since 1979, by 3.3 percent per decade. Summer sea ice has dwindled even more rapidly, by 13.2 percent per decade. Antarctica has seen recent years with record growth in sea ice, but it’s a very different environment than the Arctic, and the losses in the north far exceed any gains at the South Pole, so total global sea ice is on the decline:

Global, Arctic and Antarctic Sea Ice Area Spiral February 2018 #GlobalWarming #ClimateChange pic.twitter.com/gayoLFSJ5u — Kevin Pluck (@kevpluck) March 1, 2018

Shrinking glaciers and ice sheets : Glaciers around the world have, on average, been losing ice since the 1970s. In some areas, that is reducing the amount of available freshwater. The ice sheet on Greenland, which would raise global sea levels by 25 feet if it all melted, is declining, with some sections experiencing a sudden surge in the melt rate. The Antarctic ice sheet is also getting smaller, but at a much slower rate .

Sea level rise: Global sea levels rose 9.8 inches (25 centimeters) in the 19th and 20th centuries, after 2,000 years of relatively little change , and the pace is speeding up . Sea level rise is caused by both the thermal expansion of the oceans — as water warms up, it expands — and the melting of glaciers and ice sheets (but not sea ice).

Food supply: A hotter climate can be both good for crops (it lengthens the growing season, and more carbon dioxide can increase photosynthesis) and bad for crops (excess heat can damage plants). The IPCC found that global warming was currently benefiting crops in some high-latitude areas but that negative effects are becoming increasingly common worldwide. In areas like California, crop yields are estimated to decline 40 percent by 2050.

Shifting species: Many land and marine species have had to shift their geographic ranges in response to warmer temperatures. So far, several extinctions have been linked to global warming, such as certain frog species in Central America.

Warmer winters: In general, winters are warming faster than summers . Average low temperatures are rising all over the world. In some cases, these temperatures are climbing above the freezing point of water. We’re already seeing massive declines in snow accumulation in the United States, which can paradoxically increase flood, drought, and wildfire risk — as water that would ordinarily dispatch slowly over the course of a season instead flows through a region all at once.

Debated impacts

Here are a few other ways the Earth’s climate has been changing — but scientists are still debating whether and how they’re linked to global warming:

Droughts have become more frequent and more intense in some parts of the world — such as the American Southwest, Mediterranean Europe, and West Africa — though it’s hard to identify a clear global trend. In other parts of the world, such as the Midwestern United States and Northwestern Australia, droughts appear to have become less frequent. A recent study shows that, globally, the time between droughts is shrinking and more areas are affected by drought and taking longer to recover from them.

Hurricanes have clearly become more intense in the North Atlantic Ocean since 1970, the IPCC says. But it’s less clear whether global warming is driving this. 2017 was an exceptionally bad year for Atlantic hurricanes in terms of strength and damage. And while scientists are still uncertain whether they were a fluke or part of a trend, they are warning we should treat it as a baseline year. There doesn’t yet seem to be any clear trajectory for tropical cyclones worldwide.

5) What impacts will global warming have in the future?

It depends on how much the planet actually heats up. The changes associated with 4° Celsius (or 7.2° Fahrenheit) of warming are expected to be more dramatic than the changes associated with 2°C of warming.

Here’s a basic rundown of big impacts we can expect if global warming continues, via the IPCC ( here and here ).

Hotter temperatures: If emissions keep rising unchecked, then global average surface temperatures will be at least 2°C higher (3.6°F) than preindustrial levels by 2100 — and possibly 3°C or 4°C or more.

Higher sea level rise: The expert consensus is that global sea levels will rise somewhere between 0.2 and 2 meters by the end of the century if global warming continues unchecked (that’s between 0.6 and 6.6 feet). That’s a wide range, reflecting some of the uncertainties scientists have in how ice will melt. In specific regions like the Eastern United States, sea level rise could be even higher, and around the world, the rate of rise is accelerating .

Heat waves: A hotter planet will mean more frequent and severe heat waves .

Droughts and floods: Across the globe, wet seasons are expected to become wetter, and dry seasons drier. As the IPCC puts it , the world will see “more intense downpours, leading to more floods, yet longer dry periods between rain events, leading to more drought.”

Hurricanes: It’s not yet clear what impact global warming will have on tropical cyclones. The IPCC said it was likely that tropical cyclones would get stronger as the oceans heat up, with faster winds and heavier rainfall. But the overall number of hurricanes in many regions was likely to “either decrease or remain essentially unchanged.”

Heavier storm surges: Higher sea levels will increase the risk of storm surges and flooding when storms do hit.

Agriculture: In many parts of the world, the mix of increased heat and drought is expected to make food production more difficult. The IPCC concluded that global warming of 1°C or more could start hurting crop yields for wheat, corn, and rice by the 2030s, especially in the tropics. (This wouldn’t be uniform, however; some crops may benefit from mild warming, such as winter wheat in the United States.)

Extinctions: As the world warms, many plant and animal species will need to shift habitats at a rapid rate to maintain their current conditions. Some species will be able to keep up; others likely won’t. The Great Barrier Reef, for instance, may not be able to recover from major recent bleaching events linked to climate change. The National Research Council has estimated that a mass extinction event “could conceivably occur before the year 2100.”

Long-term changes: Most of the projected changes above will occur in the 21st century. But temperatures will keep rising after that if greenhouse gas levels aren’t stabilized. That increases the risk of more drastic longer-term shifts. One example: If West Antarctica’s ice sheet started crumbling, that could push sea levels up significantly. The National Research Council in 2013 deemed many of these rapid climate surprises unlikely this century but a real possibility further into the future.

6) What happens if the world heats up more drastically — say, 4°C?

The risks of climate change would rise considerably if temperatures rose 4° Celsius (7.2° Fahrenheit) above preindustrial levels — something that’s possible if greenhouse gas emissions keep rising at their current rate.

The IPCC says 4°C of global warming could lead to “substantial species extinctions,” “large risks to global and regional food security,” and the risk of irreversibly destabilizing Greenland’s massive ice sheet.

One huge concern is food production: A growing number of studies suggest it would become significantly more difficult for the world to grow food with 3°C or 4°C of global warming. Countries like Bangladesh, Egypt, Vietnam, and parts of Africa could see large tracts of farmland turn unusable due to rising seas. Scientists are also concerned about crops getting less nutritious due to rising CO2.

Humans could struggle to adapt to these conditions. Many people might think the impacts of 4°C of warming will simply be twice as bad as those of 2°C. But as a 2013 World Bank report argued, that’s not necessarily true. Impacts may interact with each other in unpredictable ways. Current agriculture models, for instance, don’t have a good sense of what will happen to crops if increased heat waves, droughts, new pests and diseases, and other changes all start to combine.

“Given that uncertainty remains about the full nature and scale of impacts,” the World Bank report said, “there is also no certainty that adaptation to a 4°C world is possible.” Its conclusion was blunt: “The projected 4°C warming simply must not be allowed to occur.”

7) What do climate models say about the warming that could actually happen in the coming decades?

That depends on your faith in humanity.

Climate models depend on not only complicated physics but the intricacies of human behavior over the entire planet.

Generally, the more greenhouse gases humanity pumps into the atmosphere, the warmer it will get. But scientists aren’t certain how sensitive the global climate system is to increases in greenhouse gases. And just how much we might emit over the coming decades remains an open question, depending on advances in technology and international efforts to cut emissions.

The IPCC groups these scenarios into four categories of atmospheric greenhouse gas concentrations known as Representative Concentration Pathways . They serve as standard benchmarks for evaluating climate models, but they also have some assumptions baked in .

RCP 2.6, also called RCP 3PD, is the scenario with very low greenhouse gas concentrations in the atmosphere. It bets on declining oil use, a population of 9 billion by 2100, increasing energy efficiency, and emissions holding steady until 2020, at which point they’ll decline and even go negative by 2100. This is, to put it mildly, very optimistic.

The next tier up is RCP 4.5, which still banks on ambitious reductions in emissions but anticipates an inflection point in the emissions rate around 2040. RCP 6 expects emissions to increase 75 percent above today’s levels before peaking and declining around 2060 as the world continues to rely heavily on fossil fuels.

The highest tier, RCP 8.5, is the pessimistic business-as-usual scenario, anticipating no policy changes nor any technological advances. It expects a global population of 12 billion and triple the rate of carbon dioxide emissions compared to today by 2100.

Here’s how greenhouse gas emissions under each scenario stack up next to each other:

And here’s what that means for global average temperatures, assuming that a doubling of carbon dioxide concentrations in the atmosphere leads to 3°C of warming:

As you can see, RCP 3PD is the only trajectory that keeps the planet below 2°C of warming. Recall what it would take to keep emissions in line with this pathway and you’ll understand the enormity of the challenge of meeting this goal.

8) How do we stop global warming?

The world’s nations would need to cut their greenhouse gas emissions by a lot. And even that wouldn’t stop all global warming.

For example, let’s say we wanted to limit global warming to below 2°C. To do that, the IPCC has calculated that annual greenhouse gas emissions would need to drop at least 40 to 70 percent by midcentury.

Emissions would then have to keep falling until humans were hardly emitting any extra greenhouse gases by the end of the century. We’d also have to remove carbon dioxide from the atmosphere .

Cutting emissions that sharply is a daunting task. Right now, the world gets 87 percent of its primary energy from fossil fuels: oil, gas, and coal. By contrast, just 13 percent of the world’s primary energy is “low carbon”: a little bit of wind and solar power, some nuclear power plants, a bunch of hydroelectric dams. That’s one reason global emissions keep rising each year.

To stay below 2°C, that would all need to change radically. By 2050, the IPCC notes, the world would need to triple or even quadruple the share of clean energy it uses — and keep scaling it up thereafter. Second, we’d have to get dramatically more efficient at using energy in our homes, buildings, and cars. And stop cutting down forests. And reduce emissions from agriculture and from industrial processes like cement manufacturing.

The IPCC also notes that this task becomes even more difficult the longer we put it off, because carbon dioxide and other greenhouse gases will keep piling up in the atmosphere in the meantime, and the cuts necessary to stay below the 2°C limit become more severe.

9) What are we actually doing to fight climate change?

A global problem requires global action, but with climate change, there is a yawning gap between ambition and action.

The main international effort is the 2015 Paris climate accord, of which the United States is the only country in the world that wants out . The deal was hammered out over weeks of tense negotiations and weighs in at 31 pages . What it does is actually pretty simple.

The backbone is the global target of keeping global average temperatures from rising 2°C (compared to temperatures before the Industrial Revolution) by the end of the century. Beyond 2 degrees, we risk dramatically higher seas, changes in weather patterns, food and water crises, and an overall more hostile world.

Critics have argued that the 2-degree mark is arbitrary, or even too low , to make a difference. But it’s a starting point, a goal that, before Paris, the world was on track to wildly miss.

Paris is voluntary

To accomplish this 2-degree goal, the accord states that countries should strive to reach peak emissions “as soon as possible.” (Currently, we’re on track to hit peak emissions around 2030 or later , which will likely be too late.)

But the agreement doesn’t detail exactly how these countries should do that. Instead, it provides a framework for getting momentum going on greenhouse gas reduction, with some oversight and accountability. For the US, the pledge involves 26 to 28 percent reductions by 2025. (Under Trump’s current policies, that goal is impossible .)

There’s also no defined punishment for breaking it. The idea is to create a culture of accountability (and maybe some peer pressure) to get countries to step up their climate game.

In 2020, delegates are supposed to reconvene and provide updates about their emission pledges and report on how they’re becoming more aggressive on accomplishing the 2-degree goal.

However, many countries are already falling behind on their climate change commitments, and some, like Germany, are giving up on their near-term targets.

Paris asks richer countries to help out poorer countries

There’s a fundamental inequality when it comes to global emissions. Rich countries have plundered and burned huge amounts of fossil fuels and gotten rich from them. Poor countries seeking to grow their economies are now being admonished for using the same fuels. Many low-lying poor countries also will be among the first to bear the worst impacts of climate change.

The main vehicle for rectifying this is the Green Climate Fund , via which richer countries, like the US, are supposed to send $100 billion a year in aid and financing by 2020 to the poorer countries. The United States’ share was $3 billion , but with President Trump’s decision to withdraw from the Paris accord, this goal is unlikely to be met.

The agreement matters because we absolutely need momentum on this issue

The Paris agreement is largely symbolic, and it will live on even though Trump is aiming to pull the US out. But, as Jim Tankersley wrote for Vox , “the accord will be weakened, and, much more importantly, so will the fragile international coalition” around climate change.

We’re already seeing the Paris agreement lose steam. At a follow-up climate meeting this year in Katowice, Poland , negotiators forged an agreement on measuring and verifying their progress in cutting greenhouse gases, but left many critical questions of how to achieve these reductions unanswered.

But the Paris accord isn’t the only international climate policy game in town

There are regional international climate efforts like the European Union’s Emissions Trading System . However, the most effective global policy at keeping warming in check to date doesn’t have to do with climate change, at least on the surface.

The 1987 Montreal Protocol , which was convened by countries to halt the destruction of the ozone layer, had a major side effect of averting warming. In fact, it’s been the single most effective effort humanity has undertaken to fight climate change. Since many of the substances that eat away at the ozone layer are potent heat-trappers, limiting emissions of gases like chlorofluorocarbons has an outsize effect.

And the Trump administration doesn’t appear as hostile to Montreal as it does to Paris. The White House may send the 2016 Kigali Amendment to the Montreal Protocol to the Senate for ratification, giving the new regulations the force of law. If implemented, the amendment would avert 0.5°C of warming by 2100.

Regardless of what path we choose, the key thing to remember is that we are going to pay for climate change one way or another. We have the opportunity now to address warming on our own terms, with investments in clean energy, moving people away from disaster-prone areas, and regulating greenhouse gas emissions. Otherwise, we’ll pay through diminished crop harvests, inundated coastlines, destroyed homes, lost lives, and an increasingly unlivable planet. Ignoring or stalling on climate change chooses the latter option by default. Our choices do matter, but we’re running out of time to make them.

F urther reading:

Avoiding catastrophic climate change isn’t impossible yet. Just incredibly hard.

Reckoning with climate change will demand ugly tradeoffs from environmentalists — and everyone else

Show this cartoon to anyone who doubts we need huge action on climate change

It’s time to start talking about “negative” carbon dioxide emissions

A history of the 2°C global warming target

Scientists made a detailed “roadmap” for meeting the Paris climate goals. It’s eye-opening.

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• Q&A: Exploring ethnic dynamics and climate change in Africa

Q&A: Exploring ethnic dynamics and climate change in Africa

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Evan Lieberman is the Total Professor of Political Science and Contemporary Africa at MIT, and is also director of the Center for International Studies. During a semester-long sabbatical, he’s currently based at the African Climate and Development Initiative at the University of Cape Town .

In this Q&A, Lieberman discusses several climate-related research projects he’s pursuing in South Africa and surrounding countries. This is part of an ongoing series exploring how the School of Humanities, Arts, and Social Sciences is addressing the climate crisis.

Q: South Africa is a nation whose political and economic development you have long studied and written about. Do you see this visit as an extension of the kind of research you have been pursuing, or a departure from it?

A: Much of my previous work has been animated by the question of understanding the causes and consequences of group-based disparities, whether due to AIDS or Covid. These are problems that know no geographic boundaries, and where ethnic and racial minorities are often hardest hit. Climate change is an analogous problem, with these minority populations living in places where they are most vulnerable, in heat islands in cities, and in coastal areas where they are not protected. The reality is they might get hit much harder by longer-term trends and immediate shocks.

In one line of research, I seek to understand how people in different African countries, in different ethnic groups, perceive the problems of climate change and their governments’ response to it. There are ethnic divisions of labor in terms of what people do — whether they are farmers or pastoralists, or live in cities. So some ethnic groups are simply more affected by drought or extreme weather than others, and this can be a basis for conflict, especially when competing for often limited government resources.

In this area, just like in my previous research, learning what shapes ordinary citizen perspectives is really important, because these views affect people’s everyday practices, and the extent to which they support certain kinds of policies and investments their government makes in response to climate-related challenges. But I will also try to learn more about the perspectives of policymakers and various development partners who seek to balance climate-related challenges against a host of other problems and priorities.

Q: You recently published “ Until We Have Won Our Liberty ," which examines the difficult transition of South Africa from apartheid to a democratic government, scrutinizing in particular whether the quality of life for citizens has improved in terms of housing, employment, discrimination, and ethnic conflicts. How do climate change-linked issues fit into your scholarship?

A: I never saw myself as a climate researcher, but a number of years ago, heavily influenced by what I was learning at MIT, I began to recognize more and more how important the issue of climate change is. And I realized there were lots of ways in which the climate problem resonated with other kinds of problems I had tackled in earlier parts of my work.

There was once a time when climate and the environment was the purview primarily of white progressives: the “tree huggers.” And that’s really changed in recent decades as it has become evident that the people who've been most affected by the climate emergency are ethnic and racial minorities. We saw with Hurricane Katrina and other places [that] if you are Black, you’re more likely to live in a vulnerable area and to just generally experience more environmental harms, from pollution and emissions, leaving these communities much less resilient than white communities. Government has largely not addressed this inequity. When you look at American survey data in terms of who’s concerned about climate change, Black Americans, Hispanic Americans, and Asian Americans are more unified in their worries than are white Americans.

There are analogous problems in Africa, my career research focus. Governments there have long responded in different ways to different ethnic groups. The research I am starting looks at the extent to which there are disparities in how governments try to solve climate-related challenges.

Q: It’s difficult enough in the United States taking the measure of different groups’ perceptions of the impact of climate change and government’s effectiveness in contending with it. How do you go about this in Africa?

A: Surprisingly, there’s only been a little bit of work done so far on how ordinary African citizens, who are ostensibly being hit the hardest in the world by the climate emergency, are thinking about this problem. Climate change has not been politicized there in a very big way. In fact, only 50 percent of Africans in one poll had heard of the term.

In one of my new projects, with political science faculty colleague Devin Caughey and political science doctoral student Preston Johnston, we are analyzing social and climate survey data [generated by the Afrobarometer research network] from over 30 African countries to understand within and across countries the ways in which ethnic identities structure people’s perception of the climate crisis, and their beliefs in what government ought to be doing. In largely agricultural African societies, people routinely experience drought, extreme rain, and heat. They also lack the infrastructure that can shield them from the intense variability of weather patterns. But we’re adding a lens, which is looking at sources of inequality, especially ethnic differences.

I will also be investigating specific sectors. Africa is a continent where in most places people cannot take for granted universal, piped access to clean water. In Cape Town, several years ago, the combination of failure to replace infrastructure and lack of rain caused such extreme conditions that one of the world’s most important cities almost ran out of water.

While these studies are in progress, it is clear that in many countries, there are substantively large differences in perceptions of the severity of climate change, and attitudes about who should be doing what, and who’s capable of doing what. In several countries, both perceptions and policy preferences are differentiated along ethnic lines, more so than with respect to generational or class differences within societies.

This is interesting as a phenomenon, but substantively, I think it’s important in that it may provide the basis for how politicians and government actors decide to move on allocating resources and implementing climate-protection policies. We see this kind of political calculation in the U.S. and we shouldn’t be surprised that it happens in Africa as well.

That’s ultimately one of the challenges from the perch of MIT, where we’re really interested in understanding climate change, and creating technological tools and policies for mitigating the problem or adapting to it. The reality is frustrating. The political world — those who make decisions about whether to acknowledge the problem and whether to implement resources in the best technical way — are playing a whole other game. That game is about rewarding key supporters and being reelected.

Q: So how do you go from measuring perceptions and beliefs among citizens about climate change and government responsiveness to those problems, to policies and actions that might actually reduce disparities in the way climate-vulnerable African groups receive support?

A: Some of the work I have been doing involves understanding what local and national governments across Africa are actually doing to address these problems. We will have to drill down into government budgets to determine the actual resources devoted to addressing a challenge, what sorts of practices the government follows, and the political ramifications for governments that act aggressively versus those that don’t. With the Cape Town water crisis, for example, the government dramatically changed residents’ water usage through naming and shaming, and transformed institutional practices of water collection. They made it through a major drought by using much less water, and doing it with greater energy efficiency. Through the government’s strong policy and implementation, and citizens’ active responses, an entire city, with all its disparate groups, gained resilience. Maybe we can highlight creative solutions to major climate-related problems and use them as prods to push more effective policies and solutions in other places.

In the MIT Global Diversity Lab , along with political science faculty colleague Volha Charnysh, political science doctoral student Jared Kalow, and Institute for Data, Systems and Society doctoral student Erin Walk, we are exploring American perspectives on climate-related foreign aid, asking survey respondents whether the U.S. should be giving more to people in the global South who didn’t cause the problems of climate change but have to suffer the externalities. We are particularly interested in whether people’s desire to help vulnerable communities rests on the racial or national identity of those communities.

From my new seat as director of the Center for International Studies (CIS), I hope to do more and more to connect social science findings to relevant policymakers, whether in the U.S. or in other places. CIS is making climate one of our thematic priority areas, directing hundreds of thousands of dollars for MIT faculty to spark climate collaborations with researchers worldwide through the Global Seed Fund program. 

COP 28 (the U.N. Climate Change Conference), which I attended in December in Dubai, really drove home the importance of people coming together from around the world to exchange ideas and form networks. It was unbelievably large, with 85,000 people. But so many of us shared the belief that we are not doing enough. We need enforceable global solutions and innovation. We need ways of financing. We need to provide opportunities for journalists to broadcast the importance of this problem. And we need to understand the incentives that different actors have and what sorts of messages and strategies will resonate with them, and inspire those who have resources to be more generous.

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Saturated soils could impact survival of young trees planted to address climate change

by University of Plymouth

The saturated soil conditions predicted to result from increased rainfall in the UK's upland regions could have a knock-on effect on the ambition to create more woodland in the fight against climate change, a new study has found.

Researchers from the University of Plymouth have spent a number of years exploring how temperate rainforests could be an effective nature-based solution to some of the planet's greatest challenges.

They have also shown that the UK's uplands could in future see significantly more annual rainfall than is currently being predicted in national climate models.

In new research, they found that higher soil water levels within areas such as Dartmoor, the Lake District and the Scottish Highlands could have a significant impact on the survival rates of both acorns and juvenile oak saplings.

Published in the journal Forest Ecology and Management , it is the first study to highlight the importance of factoring in soil conditions when looking at where and how to create the temperate rainforests of the future.

Dr. Thomas Murphy, Lecturer in Environmental Sciences at the University of Plymouth, is the study's lead author. He said, "In recent years, there have been increasing calls to plant more trees as part of the global effort to combat climate change . Restoration and expansion of temperate rainforests, which are a globally rare ecosystem, is seen as one of the potential solutions.

"But with our previous work also predicting an increase in future rainfall we wanted to know if the woodlands we create will support naturally colonizing trees in future. Our results show that higher water levels within soils directly contribute to reduced survival of both acorns and young oak trees. We believe it provides landowners, land managers and policy makers with important information as to which species might work in particular locations to support more resilient future rainforests."

For the study, researchers planted acorns from English oaks (Quercus robur) in containers with four soil states, from completely flooded to low saturation where the water level was 220mm below the acorn.

The acorns did not survive in the flooded soils, but survival rates improved gradually—43% at high saturation, 77% at medium saturation, and 83% at low saturation—as the water level dropped.

The surviving seedlings also exhibited reduced root:shoot ratio, leaf photosynthesis, and a lower likelihood of late season shoot growth in soils of higher saturation.

In a concurrent field experiment, juvenile English oak and Sessile oak (Quercus petraea) saplings were planted in a region of Dartmoor that is seasonally waterlogged and frequented by grazing livestock.

In these tests, the English oaks exhibited greater shoot growth and leaf photosynthesis than its close relation in areas where the soil was more saturated.

The researchers, including environmental scientists and ecologists, say the results highlight the need for better understanding of soil influence on tree development.

Dr. Murphy added, "There has been extensive talk about how larger trees respond to the effects of climate change. But these results show we need to factor in the response of young trees as well, especially if they are being envisioned as an integral part of the solution.

"By examining their response to conditions now, while also thinking about what these locations are going to be like in 50 years' time, we can better understand the right trees for the right locations, and hopefully make these woodlands more resilient in the long-term."

Journal information: Forest Ecology and Management

Provided by University of Plymouth

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Who is most to blame for climate change? Regardless of the answer, global cooperation is critical

The u.s. is the world's top polluter, which incentivizes us to lead on climate change, by matthew rozsa.

Climate change is one of the biggest existential threats to humanity, but in the ongoing struggle to fight it, a debate over which countries are most responsible for emitting the greenhouse gases accelerating the crisis. Indeed, China emits more CO2 than the U.S., but both countries are the world's top producers of this heat-trapping gas. But it doesn't just matter who emits the most, but also how long they've been doing it and what those countries are doing to curb emissions.

"Speaking personally, I think that obliges the U.S. to be a leader in the energy transition — i.e. you broke it, you fix it."

Currently, humans are experiencing the  hottest months  in  recorded human history , with scientists warning that humanity is living on  "borrowed time."  As climate change worsens people can expect frequent and intensified tropical storms, wildfires, droughts and heatwaves, as well as rising sea levels and resource scarcity. This has put a spotlight on the issue, as well as on questions of how to fix the problem. Salon spoke to several climatologists about America's role in both causing and solving climate change, and all of them agreed on two things: First, America is the world's largest legacy climate polluter — that is, they have put more total carbon pollution into the atmosphere than any other nation; and second, a heavy burden therefore falls on America to take responsibility.

"In 2023, global temperatures came close to 1.5º C above pre-industrial levels – and the US is by far the biggest contributor to that," said Dr Simon Evans, Senior Policy Editor at the policy website Carbon Brief , which among other things keeps track of greenhouse gas emissions. Evans said that their analysis shows that more than one-fifth of all the warming currently being experienced on Earth was caused by America's cumulative greenhouse gas emissions. Even though China has a much larger population than the United States (1.4 billion versus 333 million), their total role in causing global warming is only around half of America's contribution. Furthermore, China is the leader of transitioning to renewable energy .

It is "relatively easy" to estimate any country's contribution to climate change — or, for that matter, any industrial sector's contribution, Dr. Gavin A. Schmidt, a climatologist and Director of the NASA Goddard Institute for Space Studies, told Salon. He referred interested parties to a website that helps ordinary citizens acquire that information for themselves. When they do so, it is important for them to understand the science behind how climate change is happening.

"The dominant driver of current climate change is CO2 emissions, and they have a property that means (roughly speaking) that the impact on climate is related to the accumulated emissions of CO2," said Schmidt. "This is different to the impact from air pollution or methane whose effects are really just related to current emissions. So that means you can relatively easily estimate any country’s (or any sector’s) contribution to current climate change by just looking at their cumulative CO2 emissions."

By doing that, it's clear that the United States has had the largest impact, followed by the European Union, China and the United Kingdom.

Want more health and science stories in your inbox? Subscribe to Salon's weekly newsletter Lab Notes .

"That’s what we saw during the Trump presidency, when the U.S. signaled to the rest of the world it was no longer serious about climate action."

According to some climatologists, America's disproportionate role in causing climate change puts a burden on the United States to take the lead in addressing the issue.

"This means that it is absolutely essential that the U.S. take a leadership role in global climate action," said Dr. Michael E. Mann, a climatologist at the University of Pennsylvania. He said this should include "reducing carbon emissions by 60% over the next decade. Without American leadership, it’s easy for other countries to come up with excuses and do less, and even back-pedal."

Mann added, "That’s what we saw during the Trump presidency, when the U.S. signaled to the rest of the world it was no longer serious about climate action."

Dr. Peter Kalmus, a NASA climate scientist who emphasized his opinions are his own, criticized the United States for not doing more to tackle climate change.

"The U.S. needs to get its own climate ducks in a row before the other nations of the world will listen to it on climate policy," said Kalmus. "The U.S. has the wealth and technology to be a powerful global leader on climate action, but instead continues to double down on fossil fuels, which is so incredibly stupid. We've squandered the chance to do good in the world and in doing good in the world to ensure a strong post-carbon economy for ourselves. It's just so stupid. "

Salon also spoke with Dr. James Hansen, a climatologist at Columbia University whose  1988 Senate testimony  was a landmark event in the history of spreading public knowledge about global warming. Hansen said that "the fossil fuel industry decided to deny climate change rather than begin to invest in carbon-free energies." Because they discovered "it was easier to buy off politicians" than invest in green technology, oil companies have stymied efforts to spread public awareness about climate change and thereby cultivate the collective will to implement solutions. According to Hansen's recent  paper in the journal Oxford Open Climate Change, feasible solutions do exist.

"That means a simple honest rising price on carbon, implemented in a way that the public will accept, i.e., with the funds collected from the fossil fuel industry distributed to the public," Hansen said. "Additional details include the need for 'clean energy portfolio standards' not 'renewables-only portfolio standards.'"

Hansen said that although President Joe Biden has attempted to address this issue — and he, unlike Trump, recognizes the scientific reality of climate change — his policies fall far short of what is needed. Hansen described the Inflation Reduction Act, which included environmental measures, as a bill that "produces inflation by borrowing huge sums from our children and grandchildren, but which has only [a] slight effect on reducing global emissions."

Now that America has failed to take the lead globally, Hansen argues that they may have permanently forfeited their world leadership on this front.

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"Given that we failed to help get effective global policies, China is now the greatest source of present and future emissions," said Hansen. He said that "we should give priority to working with China. Instead we are intent on painting them as our enemy, an approach that tends to be self-fulfilling. The hope now is that Europe will be smart enough to not follow that lead."

The bottom line is that pointing fingers at who is the "worst" polluter is probably not a very productive use of time and energy, especially as the clock is ticking to avoid the worst effects of our changing climate. International cooperation will be key — after all, global heating is a global problem.

"Speaking personally, I think that obliges the U.S. to be a leader in the energy transition — i.e. you broke it, you fix it," Schmidt said. "But I don’t think it means that it’s all on the U.S. Rather, all the big emitters need to get their emissions down."

about climate change:

• European wine just had its worst growing season in 62 years. Climate change could make it worse
• How squirrels cope with stress: New study may offer climate lessons for humans
• Is Earth Day greenwashed and obsolete? Some climate experts argue its core message has been diluted

Matthew Rozsa is a staff writer at Salon. He received a Master's Degree in History from Rutgers-Newark in 2012 and was awarded a science journalism fellowship from the Metcalf Institute in 2022.

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Stanford Health Care earns Joint Commission’s Sustainable Healthcare certification

Stanford Health Care is among the first health care organizations in the nation to receive the certification, which celebrates its progress toward reducing emissions that contribute to climate change.

May 14, 2024

Stanford Health Care is one of the first hospitals in the nation to receive a sustainability certification from The Joint Commission. Emily Moskal

The Joint Commission has issued a Sustainable Healthcare certification to Stanford Health Care, one of the first systems in the country to achieve the honor.

The Joint Commission, which accredits U.S. health care organizations, established  the Sustainable Healthcare certificate this year to recognize organizations that have demonstrated progress in reducing emissions that contribute to climate change.

“We are proud to be recognized by The Joint Commission as a national leader in championing environmental sustainability in health care delivery,” said David Entwistle , president and CEO of Stanford Health Care. “Climate change presents ongoing challenges to the health of communities around the globe. At Stanford Health Care, we are committed to reducing our own carbon footprint and partnering across the health care sector to innovate greener practices for the benefit our patients, communities, and the planet we share.”

Health care has an important role to play in the fight against climate change, as its emissions make up 8.5% of the United States’ total amount. Hospitals also consume tremendous amounts of energy, and health care ranks near the top for waste generation, at 5.9 million tons annually.

 “The health of our patients and communities — particularly the most vulnerable — is intertwined with the health of our planet,” said Lloyd Minor , MD, dean of the School of Medicine and vice president for medical affairs at Stanford University. “To advance our mission of improving human health, it is imperative that we continue to collaborate with researchers around the globe to meet the daunting challenges of the climate crisis head on. While much work remains, I am proud of Stanford Medicine’s accomplishments and look forward to continuing our university’s and health system’s momentum in this domain.”

Stanford Health Care’s Sustainability Program Office has established four sustainability goals:

• Reducing energy use in buildings by 25% by 2030
• Diverting 90% of waste sent to landfills through recycling, composting, reusing or limiting waste by 2030
• Reducing greenhouse gas emissions by 50% by 2030
• Eliminating 90% of greenhouse gas emissions by 2050  

These goals align with the Department of Health and Human Services Climate Pledge that the organization signed in 2022.

Stanford Health Care clinicians play a leading role as sustainability champions, collaborating with infection prevention teams and building engineers to save energy and prevent waste.

In 2023, two medical directors of sustainability were established: Paige Fox , MD, PhD, associate professor of plastic and reconstructive surgery, and Praveen Kalra , MD, clinical associate professor of anesthesiology, perioperative and pain medicine, are charged with implementing changes within the clinical environment. Fox is working on reducing waste of unused medical supplies, and Kalra is championing the change from centrally piped nitrous oxide to portable cylinders, which will reduce greenhouse gas emissions related to nitrous oxide by 90%.

In 2023, the organization established a Sustainability in Nursing fellowship program. The first five fellows tackled projects such as reducing supplies that are thrown away unused, promoting sustainable commuting, and switching to reusable items rather than disposables.

“Energy efficiency and emissions reductions are linked,” said Helen Wilmot , chief facilities and sustainability officer. “To accomplish these goals, Stanford Health Care structures its efforts around utility management, energy efficiency and decarbonization, and new building design in order to have the biggest impact. We have decreased our energy use intensity by 9.1% since 2021 and are on track to reducing it 25% by 2030.”

The Joint Commission certification comes on the heels of another achievement for sustainability programs at Stanford Medicine: In 2024, Practice Greenhealth awarded Stanford Health Care and Stanford Medicine Children’s Health the Environmental Excellence Emerald Award; it also awarded Stanford Health Care Tri-Valley the Partners for Change Award.

About Stanford Medicine

Stanford Medicine is an integrated academic health system comprising the Stanford School of Medicine and adult and pediatric health care delivery systems. Together, they harness the full potential of biomedicine through collaborative research, education and clinical care for patients. For more information, please visit med.stanford.edu .

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Saturated soils could impact survival of young trees planted to address climate change

The saturated soil conditions predicted to result from increased rainfall in the UK’s upland regions could have a knock-on effect on the ambition to create more woodland in the fight against climate change, a new study has found.

Researchers from the University of Plymouth have spent a number of years exploring how temperate rainforests could be an effective nature-based solution to some of the planet’s greatest challenges.

They have also shown that the UK’s uplands could in future see significantly more annual rainfall than is currently being predicted in national climate models.

In new research, they found that higher soil water levels within areas such as Dartmoor, the Lake District and the Scottish Highlands could have a significant impact on the survival rates of both acorns and juvenile oak saplings.

Published in the journal Forest Ecology and Management , it is the first study to highlight the importance of factoring in soil conditions when looking at where and how to create the temperate rainforests of the future.

Dr Thomas Murphy, Lecturer in Environmental Sciences at the University of Plymouth, is the study’s lead author. He said: “In recent years, there have been increasing calls to plant more trees as part of the global effort to combat climate change. Restoration and expansion of temperate rainforests, which are a globally rare ecosystem, is seen as one of the potential solutions. But with our previous work also predicting an increase in future rainfall we wanted to know if the woodlands we create will support naturally colonising trees in future. Our results show that higher water levels within soils directly contribute to reduced survival of both acorns and young oak trees. We believe it provides landowners, land managers and policy makers with important information as to which species might work in particular locations to support more resilient future rainforests.”

For the study, researchers planted acorns from English oaks (Quercus robur) in containers with four soil states, from completely flooded to low saturation where the water level was 220mm below the acorn.

The acorns did not survive in the flooded soils, but survival rates improved gradually – 43% at high saturation, 77% at medium saturation, and 83% at low saturation – as the water level dropped.

The surviving seedlings also exhibited reduced root:shoot ratio, leaf photosynthesis, and a lower likelihood of late season shoot growth in soils of higher saturation.

In a concurrent field experiment, juvenile English oak and Sessile oak (Quercus petraea) saplings were planted in a region of Dartmoor that is seasonally waterlogged and frequented by grazing livestock.

In these tests, the English oaks exhibited greater shoot growth and leaf photosynthesis than its close relation in areas where the soil was more saturated.

The researchers, including environmental scientists and ecologists, say the results highlight the need for better understanding of soil influence on tree development.

Dr Murphy added: “There has been extensive talk about how larger trees respond to the effects of climate change. But these results show we need to factor in the response of young trees as well, especially if they are being envisioned as an integral part of the solution. By examining their response to conditions now, while also thinking about what these locations are going to be like in 50 years’ time, we can better understand the right trees for the right locations, and hopefully make these woodlands more resilient in the long-term.”

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Story Source:

Materials provided by University of Plymouth . Original written by Alan Williams. Note: Content may be edited for style and length.

Journal Reference :

• Thomas R. Murphy, Mick E. Hanley, Jon S. Ellis, Paul H. Lunt. Soil saturation limits early oak establishment in upland pastures for restoration of Atlantic oak woodlands . Forest Ecology and Management , 2024; 561: 121895 DOI: 10.1016/j.foreco.2024.121895

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