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Environmental Research: Ecology is a multidisciplinary, open access journal devoted to addressing important macroscale challenges at the interface of ecology, biodiversity and conservation. The journal bridges scientific progress and methodological advances with assessments of environmental change impacts on ecosystems, and the responses of those ecosystems to change, including resilience, vulnerability and adaptation. For detailed information about subject coverage see the About the journal section.

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Morgan S Tassone et al 2024 Environ. Res.: Ecology 3 015003

The direction and magnitude of tundra vegetation productivity trends inferred from the normalized difference vegetation index (NDVI) have exhibited spatiotemporal heterogeneity over recent decades. This study examined the spatial and temporal drivers of Moderate Resolution Imaging Spectroradiometer Max NDVI (a proxy for peak growing season aboveground biomass) and time-integrated (TI)-NDVI (a proxy for total growing season productivity) on the Yamal Peninsula, Siberia, Russia between 2001 and 2018. A suite of remotely-sensed environmental drivers and machine learning methods were employed to analyze this region with varying climatological conditions, landscapes, and vegetation communities to provide insight into the heterogeneity observed across the Arctic. Summer warmth index, the timing of snowmelt, and physiognomic vegetation unit best explained the spatial distribution of Max and TI-NDVI on the Yamal Peninsula, with the highest mean Max and TI-NDVI occurring where summer temperatures were higher, snowmelt occurred earlier, and erect shrub and wetland vegetation communities were dominant. Max and TI-NDVI temporal trends were positive across the majority of the Peninsula (57.4% [5.0% significant] and 97.6% [13.9% significant], respectively) between 2001 and 2018. Max and TI-NDVI trends had variable relationships with environmental drivers and were primarily influenced by coastal-inland gradients in summer warmth and soil moisture. Both Max and TI-NDVI were negatively impacted by human modification, highlighting how human disturbances are becoming an increasingly important driver of Arctic vegetation dynamics. These findings provide insight into the potential future of Arctic regions experiencing warming, moisture regime shifts, and human modification, and demonstrate the usefulness of considering multiple NDVI metrics to disentangle the effects of individual drivers across heterogeneous landscapes. Further, the spatial heterogeneity in the direction and magnitude of interannual covariation between Max NDVI, TI-NDVI, and climatic drivers highlights the difficulty in generalizing the effects of individual drivers on Arctic vegetation productivity across large regions.

C R Hakkenberg et al 2023 Environ. Res.: Ecology 2 035005

Biodiversity-structure relationships (BSRs), which describe the correlation between biodiversity and three-dimensional forest structure, have been used to map spatial patterns in biodiversity based on forest structural attributes derived from lidar. However, with the advent of spaceborne lidar like the Global Ecosystem Dynamics Investigation (GEDI), investigators are confronted with how to predict biodiversity from discrete GEDI footprints, sampled discontinuously across the Earth surface and often spatially offset from where diversity was measured in the field. In this study, we used National Ecological Observation Network data in a hierarchical modeling framework to assess how spatially-coincident BSRs (where field-observed taxonomic diversity measurements and structural data from airborne lidar coincide at a single plot) compare with BSRs based on statistical aggregates of proximate, but spatially-dispersed GEDI samples of structure. Despite substantial ecoregional variation, results confirm cross-biome consistency in the relationship between plant/tree alpha diversity and spatially-coincident lidar data, including structural data from outside the field plot where diversity was measured. Moreover, we found that generalized forest structural profiles derived from GEDI footprint aggregates were consistently related to tree alpha diversity, as well as cross-biome patterns in beta and gamma diversity. These findings suggest that characteristic forest structural profiles generated from aggregated GEDI footprints are effective for BSR diversity prediction without incorporation of more standard predictors of biodiversity like climate, topography, or optical reflectance. Cross-scale comparisons between airborne- and GEDI-derived structural profiles provide guidance for balancing scale-dependent trade-offs between spatial proximity and sample size for BSR-based prediction with GEDI gridded products. This study fills a critical gap in our understanding of how generalized forest structural attributes can be used to infer specific field-observed biodiversity patterns, including those not directly observable from remote sensing instruments. Moreover, it bolsters the empirical basis for global-scale biodiversity prediction with GEDI spaceborne lidar.

Louise Mercer et al 2023 Environ. Res.: Ecology 2 045001

Community-based monitoring (CBM) is increasingly cited as a means of collecting valuable baseline data that can contribute to our understanding of environmental change whilst supporting Indigenous governance and self-determination in research. However, current environmental CBM models have specific limitations that impact program effectiveness and the progression of research stages beyond data collection. Here, we highlight key aspects that limit the progression of Arctic CBM programs which include funding constraints, organisational structures, and operational processes. Exemplars from collaborative environmental research conducted in the acutely climate change impacted Hamlet of Tuktoyaktuk, Inuvialuit Settlement Region (ISR), Canada, are used to identify co-developed solutions to address these challenges. These learnings from experience-based collaborations feed into a new solution-orientated model of environmental community-based research (CBR) that emphasises continuity between and community ownership in all research stages to enable a more complete research workflow. Clear recommendations are provided to develop a more coherent approach to achieving this model, which can be adapted to guide the development of successful environmental CBR programs in different research and place-based contexts.

Yu Nan et al 2023 Environ. Res.: Ecology 2 015003

The modern economic growth paradigm relies heavily on natural endowments. Renewable energy as a permanent energy source has the potential to reduce the ecological footprint (EF). We adopt the Vector Autoregressive model to examine the impact of renewable energy consumption on the energy EF and use the quantile regression method to test the heterogeneity and asymmetry between energy EF and photovoltaic, wind energy, and biomass energy. The results show that renewable energy has a long-term negative impact on the EF, and for every 1% increase in renewable energy consumption, the energy EF will decrease by 2.91%. The contribution of renewable energy consumption to reducing the EF is 1.34% on average. There is no two-way Granger causality between renewable energy consumption and energy EF. The reduction effect of wind energy consumption on the energy EF varies the most, followed by biomass energy and photovoltaic. In addition, under different energy EF distribution conditions, the impact of photovoltaic or wind energy or biomass energy consumption on the energy EF is different.

Christopher E Doughty et al 2023 Environ. Res.: Ecology 2 035002

The stratified nature of tropical forest structure had been noted by early explorers, but until recent use of satellite-based LiDAR (GEDI, or Global Ecosystems Dynamics Investigation LiDAR), it was not possible to quantify stratification across all tropical forests. Understanding stratification is important because by some estimates, a majority of the world's species inhabit tropical forest canopies. Stratification can modify vertical microenvironment, and thus can affect a species' susceptibility to anthropogenic climate change. Here we find that, based on analyzing each GEDI 25 m diameter footprint in tropical forests (after screening for human impact), most footprints (60%–90%) do not have multiple layers of vegetation. The most common forest structure has a minimum plant area index (PAI) at ∼40 m followed by an increase in PAI until ∼15 m followed by a decline in PAI to the ground layer (described hereafter as a one peak footprint). There are large geographic patterns to forest structure within the Amazon basin (ranging between 60% and 90% one peak) and between the Amazon (79 ± 9% sd) and SE Asia or Africa (72 ± 14% v 73 ± 11%). The number of canopy layers is significantly correlated with tree height ( r 2 = 0.12) and forest biomass ( r 2 = 0.14). Environmental variables such as maximum temperature ( T max ) ( r 2 = 0.05), vapor pressure deficit (VPD) ( r 2 = 0.03) and soil fertility proxies (e.g. total cation exchange capacity − r 2 = 0.01) were also statistically significant but less strongly correlated given the complex and heterogeneous local structural to regional climatic interactions. Certain boundaries, like the Pebas Formation and Ecoregions, clearly delineate continental scale structural changes. More broadly, deviation from more ideal conditions (e.g. lower fertility or higher temperatures) leads to shorter, less stratified forests with lower biomass.

M M Seeley et al 2024 Environ. Res.: Ecology 3 011001

Vegetation species mapping using airborne imaging spectroscopy yields accurate results and is important for advancing conservation objectives and biogeographic studies. As these data become more readily available owing to the upcoming launch of spaceborne imaging spectrometers, it is necessary to understand how these data can be used to consistently classify species across large geographic scales. However, few studies have attempted to map species across multiple ecosystems; therefore, little is known regarding the effect of intra-specific variation on the mapping of a single species across a wide range of environments and among varying backgrounds of other non-target species. To explore this effect, we developed and tested species classification models for Metrosideros polymorpha , a highly polymorphic canopy species endemic to Hawai'i, which is found in a diverse array of ecosystems. We compared the accuracies of support vector machine (SVM) and random forest models trained on canopy reflectance data from each of eight distinct ecosystems (ecosystem-specific) and a universal model trained on data from all ecosystems. When applied to ecosystem-specific test datasets, the ecosystem-specific models outperformed the universal model; however, the universal model retained high (>81%) accuracies across all ecosystems. Additionally, we found that models from ecosystems with broad variation in M. polymorpha canopy traits, as estimated using chemometric equations applied to canopy spectra, accurately predicted M. polymorpha in other ecosystems. While species classifications across ecosystems can yield accurate results, these results will require sampling procedures that capture the intra-specific variation of the target species.

K Best et al 2023 Environ. Res.: Ecology 2 045003

Significant uncertainties persist concerning how Arctic soil tundra carbon emission responds to environmental changes. In this study, 24 cores were sampled from drier (high centre polygons and rims) and wetter (low centre polygons and troughs) permafrost tundra ecosystems. We examined how soil CO 2 and CH 4 fluxes responded to laboratory-based manipulations of soil temperature (and associated thaw depth) and water table depth, representing current and projected conditions in the Arctic. Similar soil CO 2 respiration rates occurred in both the drier and the wetter sites, suggesting that a significant proportion of soil CO 2 emission occurs via anaerobic respiration under water-saturated conditions in these Arctic tundra ecosystems. In the absence of vegetation, soil CO 2 respiration rates decreased sharply within the first 7 weeks of the experiment, while CH 4 emissions remained stable for the entire 26 weeks of the experiment. These patterns suggest that soil CO 2 emission is more related to plant input than CH 4 production and emission. The stable and substantial CH 4 emission observed over the entire course of the experiment suggests that temperature limitations, rather than labile carbon limitations, play a predominant role in CH 4 production in deeper soil layers. This is likely due to the presence of a substantial source of labile carbon in these carbon-rich soils. The small soil temperature difference (a median difference of 1 °C) and a more substantial thaw depth difference (a median difference of 6 cm) between the high and low temperature treatments resulted in a non-significant difference between soil CO 2 and CH 4 emissions. Although hydrology continued to be the primary factor influencing CH 4 emissions, these emissions remained low in the drier ecosystem, even with a water table at the surface. This result suggests the potential absence of a methanogenic microbial community in high-centre polygon and rim ecosystems. Overall, our results suggest that the temperature increases reported for these Arctic regions are not responsible for increases in carbon losses. Instead, it is the changes in hydrology that exert significant control over soil CO 2 and CH 4 emissions.

Casey L Brown et al 2022 Environ. Res.: Ecology 1 011002

Consistent with a warming climate, the timing of key phenological phases (i.e. phenophases) for many plant species is shifting, but the direction and extent of these shifts remain unclear. For large herbivores such as ungulates, altered plant phenology can have important nutritional and demographic consequences. We used two multi-year datasets collected during 1992–1996 and 2015–2019 of understory plant phenology in semi-arid forested rangelands in northeastern Oregon, United States, to test whether the duration of phenophases for forage species has changed over time for three plant functional groups (forbs, graminoids, and shrubs). Duration of spring green-up was approximately 2 weeks shorter in the later years for forbs (19 ± 3.8 d) and graminoids (13.2 ± 2.8 d), and senescence was 3 weeks longer for graminoids (25.1 ± 5.1) and shrubs (22.0 ± 4.6). Average peak flowering date was 3.1 ± 0.2 d earlier per decade for understory forage species with approximately 1/3 of the species (35%) exhibiting earlier peak flowering dates over time. Variation in late-winter precipitation had the greatest effect on the duration of understory green-up, whereas variation in summer precipitation had a greater effect on duration of the senescent period. Collectively, these results indicate climate-related progression towards shorter periods of peak plant productivity, and earlier and longer periods of plant senescence, the combination of which substantially reduces the temporal window of forage available in growing forms most usable to herbivores. This work adds a needed component to the climate change literature, by describing links between shifting climate variables, multiple phases of understory plant phenology, and possible nutritional consequences for herbivores under a warming climate.

Mei-Ling E Feng et al 2022 Environ. Res.: Ecology 1 011004

Animal-related outages (AROs) are a prevalent form of outages in electrical distribution systems. Animal-infrastructure interactions vary across species and regions, underlining the need to study the animal-outage relationship in more species and diverse systems. Animal activity has been an indicator of reliability in the electrical grid system by describing temporal patterns in AROs. However, these ARO models have been limited by a lack of available species activity data, instead approximating activity based on seasonal patterns and weather dependency in ARO records and characteristics of broad taxonomic groups, e.g. squirrels. We highlight available resources to fill the ecological data gap limiting joint analyses between ecology and energy sectors. Species distribution modeling (SDM), a common technique to model the distribution of a species across geographic space and time, paired with community science data, provided us with species-specific estimates of activity to analyze alongside spatio-temporal patterns of ARO severity. We use SDM estimates of activity for multiple outage-prone bird species to examine whether diverse animal activity patterns were important predictors of ARO severity by capturing existing variation within animal-outage relationships. Low dimensional representation and single patterns of bird activity were important predictors of ARO severity in Massachusetts. However, both patterns of summer migrants and overwintering species showed some degree of importance, indicating that multiple biological patterns could be considered in future models of grid reliability. Making the best available resources from quantitative ecology known to outside disciplines can allow for more interdisciplinary data analyses between ecological and non-ecological systems. This can result in further opportunities to examine and validate the relationships between animal activity and grid reliability in diverse systems.

Latest articles

Manette E Sandor et al 2024 Environ. Res.: Ecology 3 015002

How species richness scales spatially is a foundational concept of community ecology, but how biotic interactions scale spatially is poorly known. Previous studies have proposed interactions-area relationships (IARs) based on two competing relationships for how the number of interactions scale with the number of species, the 'link-species scaling law' and the 'constant connectance hypothesis.' The link-species scaling law posits that the number of interactions per species remains constant as the size of the network increases. The constant connectance hypothesis says that the proportion of realized interactions remains constant with network size. While few tests of these IARs exist, evidence for the original interactions-species relationships are mixed. We propose a novel IAR and test it against the two existing IARs. We first present a general theory for how interactions scale spatially and the mathematical relationship between the IAR and the species richness-area curve. We then provide a new mathematical formulation of the IAR, accounting for connectance varying with area. Employing data from three mutualistic networks (i.e. a network which specifies interconnected and mutually-beneficial interactions between two groups of species), we evaluate three competing models of how interactions scale spatially: two previously published IAR models and our proposed IAR. We find the new IAR described by our theory-based equation fits the empirical datasets equally as well as the previously proposed IAR based on the link-species scaling law in one out of three cases and better than the previously-proposed models in two out of three cases. Our novel IAR improves upon previous models and quantifies mutualist interactions across space, which is paramount to understanding biodiversity and preventing its loss.

Ezrah Natumanya et al 2024 Environ. Res.: Ecology 3 015001

Riparian vegetation usually gets less focus in biodiversity assessments and yet species diversity is important knowledge when applying patch specific conservation value in the Niassa Special Reserve (NSR). This study assessed the composition and conservation status of riparian species in an exposed river basin downstream location. Purposive sampling was used in the selection of sites and respondents to maximize data collection. The study found 19 species belonging to 15 families with 52.63% of them having a frequency of ⩾50% in sampling plots. There were 10 species that are endemic to the sub-Sharan Africa Region. Fabaceae was the dominant family with 5 species. The species with the highest population was Flacourtia indica (Burm. f.) Merr. Species richness ranged from 0.35 to 0.98 with a mean of 0.66 ± 0.22. The IVI ranged from 34.70 ( F. indica (Burm. f.) Merr) to 4.43 ( Tribulus cistoides L.) with a mean of 15.79 ± 7.79. Threats of species loss and ecosystem disturbance were agriculture, infrastructure development and plant harvests. There was a reported decline in species availability over the previous 10 years by 18.7% of the respondents. The results added to existing studies and records of vegetation species of conservation value in areas exposed to loss in the NSR. This study advances research on vegetation range dynamics in the NSR and presents a need to mitigate human land use impacts on riparian vegetation species composition.

Edgar J Lozada-Gómez and Omar Pérez-Reyes 2023 Environ. Res.: Ecology 2 045004

Most freshwater habitats have been substantially affected by anthropogenic factors such as fish introductions, plastic pollution, and river regulation. Urban rivers are highly vulnerable to impacts associated with land use changes resulting from increasing urbanization, including altering habitat and establishing aquatic biological communities in these areas. In turn, the introduction of exotic species into sensitive and threatened ecosystems such as tropical urban streams and their rapid establishment, such as Pterygoplichthys multiradiatus , was used as an ecological model to determine the relative population size of the species. Also, the species was used to evaluate the presence of microplastics (MPs) in the gastrointestinal tract (GIT) of fish in rivers with different land use history. Our results showed significant differences in pleco abundance between areas with high and low urban (LU) development in the watersheds. The study demonstrated that abiotic environmental factors directly influence the relative abundance of plecos at the range and watershed scales. In a total of 42 fish examined, only 85.7% showed MPs retained in the GIT, with fibers and fragments being the most common. A total of 22 pieces of microplastic were identified with Nile Red staining by slide analysis. A significant difference was found between the abundance of microplastic ingested per total fish length between streams with high and LU development reaches. Therefore, in relatively small amounts, microplastic ingestion appears to be common in P. multiradiatus species, regardless of the habitat in which they are found and the diet present.

Review articles

Davide Vione 2023 Environ. Res.: Ecology 2 012001

Reactions induced by sunlight (direct photolysis and indirect photochemistry) are important ecosystem services that aid freshwater bodies in removing contaminants, although they may also exacerbate pollution in some cases. Without photoinduced reactions, pollution problems would be considerably worse overall. The photochemical reaction rates depend on seasonality, depth, water chemistry (which also significantly affects the reaction pathways), and pollutant photoreactivity. Photochemical reactions are also deeply impacted by less studied factors, including hydrology, water dynamics, and precipitation regimes, which are key to understanding the main impacts of climate change on surface-water photochemistry. Climate change is expected in many cases to both exacerbate freshwater pollution, and enhance photochemical decontamination. Therefore, photochemical knowledge will be essential to understand the future evolution of freshwater environments.

Accepted manuscripts

Yu et al 

Height of woody plants is a defining characteristic of ecosystems because height responds climate, soil and disturbance. Orbiting LiDAR instruments, ICESat-2 and GEDI, can provide near-global datasets of plant height at high resolution. We evaluate canopy height measurements from ICESat-2 and GEDI with airborne LiDAR in six study sites across different biomes with mean canopy height of 0.5-40 m. ICESat-2 and GEDI provide reliable estimates for the relative height with RMSE and MAE of 7.49 and 4.64 m (ICESat-2) and 6.52 and 4.08 m (GEDI) for 98th percentile relative heights. Both sensors overestimate the height of short shrubs (1-2 m at 5 m reference height), underestimate that of tall trees (by 6-7 m at 40 m reference height) and are highly biased (>3 m) for reference height < 5 m. Height estimates for both sensors were only weakly sensitive to canopy cover and terrain slope with lower RMSE for night compared to day samples (ICESat-2: 5.57 m, day: 6.82 m; GEDI night: 5.94 m, day: 7.03 m). For GEDI, day versus night differences had little effect on bias. Accuracy of ICESat-2 and GEDI canopy heights varies among biomes, and the highest MAE was observed in the tallest forest (GEDI: 7.85 m; ICESat-2: 7.84 m (night) and 12.83 m (day)).

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• 2022-present Environmental Research: Ecology doi: 10.1088/issn.2752-664X Online ISSN: 2752-664X

Environmental Science: Water Research & Technology  

About Environmental Science: Water Research & Technology

Innovation for Sustainable Water Editor-in-chief: Graham Gagnon Impact factor: 5.0 Time to first decision (peer reviewed only): 52 days

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Collection  06 March 2024

Earth, Environment and Ecology Top 100 of 2023

This collection highlights the most downloaded* Earth science, environmental science and ecology research papers published by Scientific Reports in 2023. Featuring authors from around the world, these papers highlight valuable research from an international community.

You can also view the journal's overall Top 100 or the Top 100 within various subject areas . *Data obtained from SN Insights, which is based on Digital Science’s Dimensions.

An extraordinary fossil captures the struggle for existence during the Mesozoic

• Jordan C. Mallon

A new spinosaurid dinosaur species from the Early Cretaceous of Cinctorres (Spain)

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Generation of equatorial plasma bubble after the 2022 Tonga volcanic eruption

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An ethological analysis of close-contact inter-cat interactions determining if cats are playing, fighting, or something in between

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First terror bird footprints reveal functionally didactyl posture

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New theropod dinosaur from the Lower Cretaceous of Japan provides critical implications for the early evolution of ornithomimosaurs

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Carbon dioxide reduction by photosynthesis undetectable even during phytoplankton blooms in two lakes

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The rise of macropredatory pliosaurids near the Early-Middle Jurassic transition

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Large-scale effects of offshore wind farms on seabirds of high conservation concern

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Observed increases in North Atlantic tropical cyclone peak intensification rates

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A simple soil mass correction for a more accurate determination of soil carbon stock changes

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Statistical evaluation of character support reveals the instability of higher-level dinosaur phylogeny

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35,000 years of recurrent visits inside Nerja cave (Andalusia, Spain) based on charcoals and soot micro-layers analyses

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Anthropogenic influence on extremes and risk hotspots

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A new hazard scenario at Vesuvius: deadly thermal impact of detached ash cloud surges in 79CE at Herculaneum

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GlobalUsefulNativeTrees, a database documenting 14,014 tree species, supports synergies between biodiversity recovery and local livelihoods in landscape restoration

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Marine records reveal multiple phases of Toba’s last volcanic activity

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The degree of urbanisation reduces wild bee and butterfly diversity and alters the patterns of flower-visitation in urban dry grasslands

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Episodic transient deformation revealed by the analysis of multiple GNSS networks in the Noto Peninsula, central Japan

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Organic geochemical evidence of human-controlled fires at Acheulean site of Valdocarros II (Spain, 245 kya)

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• Susana Rubio-Jara
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Playing “hide and seek” with the Mediterranean monk seal: a citizen science dataset reveals its distribution from molecular traces (eDNA)

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• Giacomo Tavecchia
• Paolo Galli

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A Systematic Review of E-Waste Generation and Environmental Management of Asia Pacific Countries

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Due to the rapid increase in the use of electrical and electronic equipment (EEE) worldwide, e-waste has become a critical environmental issue for many governments around the world. Several studies have pointed out that failure to adopt appropriate recycling practices for e-waste may cause environmental disasters and health concerns to humans due to the presence of hazardous materials. This warrants the need for a review of the existing processes of e-waste management. In view of the growing e-waste generation in the Asia Pacific region and the importance of e-waste management, this study critically reviews previous research on e-waste generation and management practices of major e-waste producing nations (Australia, China, India, Indonesia, and Malaysia) in the Asia Pacific region, provides an overview of progress made and identifies areas for improvement. To fulfil the aims of this research, previous studies from 2005 to 2020 are collected from various databases. Accordingly, this study focuses on e-waste generation and environmental management of these countries. This study found that e-waste management practices of the selected countries need to be enhanced and recommends several best practices for effectively managing e-waste.

1. Introduction

The Asia Pacific region is highly populated and is considered one of the fastest developing regions in the world. In addition, many countries in this region underwent rapid industrialisation, driven by foreign direct investments [ 1 ] due to a relatively cheap labour force. One of the industries that benefited from these factors is the electrical and electronics industry, which has experienced a major transformation due to increased technological and market developments [ 2 ]. Today, electrical and electronic equipment (EEE) has become indispensable and enhance living standards, but often contain toxic chemicals that negatively impact human health and the environment and fuel the climate crisis [ 2 , 3 ]. The growth in demand and increased sales of EEE have consequently led to the rise in the volume of e-waste [ 3 , 4 , 5 ].

E-waste is one of the most urgent and pressing challenges of our time; however, it is routinely ignored. Across the world, the growing amount of e-waste threatens the environment and local communities, as incorrectly disposed e-waste results in life-endangering toxic chemicals released into the environment and the loss of precious metals [ 2 , 4 , 5 , 6 , 7 ]. Perkins et al. [ 8 ] point out that the amount of e-waste generated each year is increasing at an alarming rate. In 2019 alone, more than 50 million tons (Mt) of e-waste was generated globally. Of this total e-waste, 24.9 million tons were generated in the Asia Pacific region alone. The amount of e-waste generated worldwide increased three times faster than the world’s population. Forti et al. [ 2 ] estimate that the volume of e-waste generated globally will exceed 74 million tons (Mt) by 2030. However, the level of recycling is not keeping up the pace. In fact, less than 13 per cent of e-waste was recycled in the same year. Moreover, the majority of e-waste generated is being diverted for landfilling, which is a common approach to disposing of e-waste worldwide [ 9 ]. The major issue with the current e-waste management practices is: (a) lack of efficient collection and recycling systems and (b) lack of mechanisms to hold producers of EEE accountable for the end-of-life disposal [ 2 ]. Hence, failure to adopt appropriate e-waste recycling processes may lead to enormous environmental and health issues [ 3 , 10 , 11 , 12 , 13 ].

This study identified three research gaps. Firstly, although, literature presents results of various studies on e-waste generation [ 3 , 4 , 5 , 8 , 14 , 15 , 16 , 17 ], recycling [ 14 , 15 , 16 , 17 ], treatment [ 4 , 18 , 19 , 20 ], and environmental management [ 8 , 21 , 22 , 23 , 24 ]; however, few studies have focused on the impact of e-waste generated in the Asia Pacific countries selected and its consequential effects on human health and the environment. Secondly, Forti et al. [ 2 ] suggest that many countries, including countries in the Asia Pacific region, are not sufficiently managing e-waste generated, and greater effort is needed to ensure smarter and more sustainable global production, consumption, management, and disposal of e-waste. The authors also indicated that more e-waste is generated than is being safely recycled in many countries of the world, and more corporative efforts are needed to tackle the escalating e-waste problem through appropriate research and training. Forti et al. [ 2 ] and Balde et al. [ 3 ] noted that the issues emanating from e-waste management in today’s digitally connected world are primarily due to the way we produce, use, and dispose of electronic devices, which are currently unsustainable. Bhaskar and Kumar [ 25 ] added that implementing appropriate e-waste management strategies will contribute to the achievement of sustainable development goals and reduce the global climate crisis through developing the necessary, needed, and required e-waste policies. Thirdly, while investigations and discussions on e-waste generation and management have been ongoing for several decades. However, the problems and challenges on e-waste generation and management remain unabated [ 2 , 26 , 27 ].

The purpose of this study is to critically review the existing strategies and practices adopted by the major e-waste producing countries in the Asia Pacific region in managing and regulating e-waste to minimise the environmental and health impacts created as a result of inappropriate recycling and disposal practices.

A key initiative and motivation of this study is to identify the problems/challenges in managing e-waste in the selected Asia Pacific countries and recommend appropriate management strategies and policy approaches to handle and regulate e-waste to significantly reduce environmental and health concerns. Accordingly, this study reviews previous research on e-waste generation and environmental management of Australia, China, India, Indonesia, and Malaysia, identifies problems and challenges that negatively impact e-waste management in these countries, provides an overview of progress made, and identifies areas for future research.

The selected countries (Australia, China, India, Indonesia, and Malaysia) are among the largest producers of e-waste in the Asia Pacific region [ 2 , 13 , 18 , 28 ]. To fulfil the aims of this study, a comprehensive review of previous research articles on e-waste published from 2005 to 2020 was conducted. This study focuses on aspects such as the amount of e-waste generated, current recycling and disposal methods, environmental management of e-waste, individual/collective attitudes towards e-waste, current e-waste problems/challenges of selected countries. In addition, prior studies of the selected countries are categorised based on the type and scope of research, location of study, and e-waste categories analysed. This study uses the outcomes of previous studies, considers country-specific issues, and identifies future research areas to present best practices for e-waste generation and environmental management.

This paper is organised into five sections. The first section presents current literature on e-waste, the research problem, research gaps and research aim, and justification for this study. The second section outlines the chosen methodology and the justification for considering a systematic literature review. The third section details the e-waste management practices in the selected countries. The fourth section provides the results of this study and analyzes the results. The final section presents the findings of this study, limitations associated with the current study, policy recommendations for effective e-waste management, and future research opportunities.

2. Research Methods

In recent years, researchers have increasingly used quantitative and qualitative research (mixed methods) techniques to expand the scope and improve the analytic power of their studies [ 29 , 30 ]. Quantitative research method is a statistical and interpretive technique used to describe or explain the meaning and relationships of a phenomenon under investigation. Quantitative research typically involves probability sampling to allow statistical inferences to be made [ 29 , 31 ]. In contrast, qualitative research method is a non-numerical, precise count of some behaviour, attitudes, knowledge, or opinion for ascertaining and understanding the meaning and relationships of certain phenomena for generalisation. It typically involves purposeful sampling to improve understanding of the issues being examined [ 29 , 30 , 31 ].

This study adopts a qualitative research method to explore the issues relating to e-waste in the selected countries from existing research over the past years to guide future research in this area. To achieve the aim of this study, the five-phase approach of Wolfswinkel et al. [ 32 ] for conducting a systematic review and analysis of the literature is adopted. Adopting this five-phase approach enables the researchers to conduct a thorough search process and critically review and analyse the articles retrieved from the databases. The five-phase approach includes: (a) defining the scope of the review, (b) searching the literature, (c) selecting the final samples, (d) analysing the samples using content analysis, and (e) presenting the findings.

The first phase is to define the scope of the review. This includes the definition of specific criteria for the inclusion and exclusion of relevant sources and the criteria for identifying and retrieving those sources in the literature. In this study, four prominent databases are used to source literature, including ProQuest, Emerald, ScienceDirect, and Web of Science. The selection of these databases is due to their representativeness and coverage in the publication of top academic papers on e-waste in the selected countries. To ensure broad coverage of the studies in these databases, several keywords have been used for the search, which includes “electronic waste”, “e-waste”, “waste electrical and electronic equipment”, “e-waste management”, “e-waste recycling,” “e-waste disposal methods”, “e-waste problems and challenges” and “environmental management of e-waste”. Several criteria are used to set the limitation, including restricting the document type to scholarly journals, peer-reviewed conference papers, book chapters, and other institutional reports from United Nations (UN) and World Health Organization (WHO); the language in English, and the publication date from 2005 to 2020. These document types have been selected as they represent state-of-the-art research outputs with high impact [ 32 ].

The second phase is to run the search query within the selected databases for retrieving the search results. A total of 688 articles are returned using the above pre-defined search strings. This initial search enables us to gain a general understanding of the coverage of e-waste topics.

The third phase involves selecting the final samples for detailed analysis. The search is limited to the title and the abstract to focus on the search results. Titles and abstracts of all initial articles are screened for checking the relevance to e-waste. This leads to the identification of 235 relevant articles. Duplicate articles are removed. A total of 210 articles is assessed for eligibility, and after excluding those articles that did not meet eligibility criteria, a total of 185 articles is identified for further review.

The 185 articles have been read in full for coding and analysis. NVivo 12.0 is used for providing an overview of the general topics from all the abstracts of the included papers. An overview of the dispersion of the selected papers in terms of year of publication shows there is increased interest in e-waste from 2005 to 2020. Figure 1 below illustrates the search process using the PRISMA flow diagram.

PRISMA flow chart indicating the results of searches.

3. Overview of E-Waste

E-waste is defined as an electrical appliance that no longer satisfies the user for its intended purpose [ 33 ]. Meanwhile, StEP [ 34 ] defines e-waste as a term used to cover items of all types of EEE and its parts that have been discarded by the owner as waste without the intention of reuse.

Table 1 shows e-waste generated around the world and per continent in 2016. It is observed that the Asian continent generated the highest e-waste, followed by Europe and the Americas. Interestingly, the African continent produced one of the lowest e-waste even though it is the second most populated continent in the world [ 35 ]. Although the African continent produced the lowest amounts of e-waste due to slow technological growth and limited access to energy when compared to other continents, they suffer other kinds of pollution problems caused by traffic emissions, oil spills, heavy metals, refuse dumps, dust, and open burnings and incineration, which significantly contribute to environmental contamination in Africa [ 36 , 37 , 38 ]. Human exposure to toxic metals and environmental pollution has become a major health risk in Africa and is the subject of increasing attention to national and international researchers and environmentalists [ 37 , 38 ].

E-waste generated around the world and per continent in 2016 [ 4 ].

A further study was conducted in 2019 whereby the Asia Pacific region also generated the highest amount of e-waste in comparison to America, Europe, Africa, and Oceania regions. The Asia Pacific region generated around 25 Mt, followed by America at 13.1 Mt and Europe at 12.1 Mt. The study also showed that Africa generated 2.9 Mt and Oceania generated 0.7 Mt of e-waste [ 2 , 39 ]. This warrants the need to conduct a study on e-waste generation and environmental management of countries in the Asia Pacific region [ 14 , 15 , 40 ].

3.1. Constituents of E-Waste

Over the years, the use of electronic devices for domestic and commercial purposes has grown rapidly [ 8 ]. E-waste generally consists of a range of hazardous materials ( Table 2 ), including metals, pollutants, printed circuit boards, computer monitors, cables, plastics, and metal-plastic mixtures [ 2 ]. The composition and quantities of these materials vary in each electronic device depending on the manufacturer, the equipment type, model, and the age it was discarded. In comparison to household e-waste, the e-waste from the IT and telecommunication sector generally contains metals that are of high economic value [ 41 , 42 ]. These metals are generally categorised into precious and toxic metals. Precious metals include gold, silver, aluminium, iron, copper, platinum, etc. The value of precious metals in e-waste is estimated to be worth USD 14 billion. However, more than 50 per cent of these metals are not recovered [ 2 ]. Meanwhile, toxic metals in e-waste include mercury, cadmium, lead, and chromium [ 2 , 43 ].

The distinctive contents of e-waste.

3.2. E-Waste Generation and Management Practices

This study has selected five countries, including Australia, China, India, Indonesia, and Malaysia, from the Asia Pacific region because they are the major e-waste producers in the region. In line with the aim of this study, this section presents an in-depth analysis of waste generation, policies and management practices adopted by the selected countries in the Asia Pacific region. In addition, this section presents literature on e-waste generation and the opinions of scholars in this field. The following sub-sections explain e-waste management practices for the selected countries in the Asia Pacific region. Table 3 below presents e-waste key statistics for the selected countries.

E-waste key statistics 2019.

3.2.1. Australia

Australia is placed among the top 10 consumers of electronic products in the world. As a result, e-waste has become one of the fastest-growing waste streams in Australia [ 9 , 44 , 45 ]. The total and per capita e-waste generation in Australia has steadily increased in the last 10 years from 410 Kilotons (Kt) in 2010 to 554 Kt in 2019 as a result of an increase in sales of EEE [ 2 ]. Previously, due to the lack of an e-waste national regulatory framework, local government councils had difficulties in managing e-waste, and they had no strategies to address e-waste issues [ 46 , 47 ]. To resolve the nation’s escalating e-waste challenges, the Australian government established the National Waste Policy in 2019 to integrate existing policies and regulatory frameworks for e-waste management [ 9 , 45 , 48 ]. Thereafter, the Australian government introduced the National Product Stewardship Scheme in 2011 in collaboration with the State and Territory Governments and industries [ 9 , 26 , 45 ].

The introduction of the National Waste Policy in 2009 was designed to set the direction of Australia’s e-waste management and resource recovery for 10 years from 2010 to 2020. The policy was established to achieve several goals, including compliance to international obligations such as the Basel and Stockholm Conventions, reducing the generation of e-waste, and ensuring e-waste treatment, disposal, recovery, and reuse is safe and environmentally sound [ 44 , 47 ]. The Product Stewardship Act of 2011 was also designed to establish a framework by which the environmental, health, and safety impacts of electrical and electronic equipment and its recycling and disposal are adequately managed [ 44 , 45 ]. Currently, Australia’s e-waste system is in its evolving stages and while, progress has been made since the introduction of the National Waste Policy and the Product Stewardship Act, Australia’s e-waste is growing three times faster than other waste streams, and the capacity and sophistication of the nation’s systems need to grow and adapt [ 44 , 48 ].

3.2.2. China

China is one of the leading producers of EEE, and currently, the country is experiencing incredible growth in e-waste generation from both domestic and international sources [ 9 , 26 , 49 ]. Formal e-waste management in China is driven by government agencies designed to improve e-waste recycling and disposal and to encourage manufacturers to take back their products [ 21 , 49 ]. Thus, Chinese e-waste regulations are focused on extended producer responsibility (EPR), polluter pays, and 3Rs (reduce, reuse, recycle) principles [ 50 ].

Informal e-waste recycling in China is often carried out by individual recyclers and unauthorised dismantling companies. Informal recyclers purchase used items and often either dismantle or repair them for the second-hand market. This unregulated e-waste recycling method is currently flourishing in China. Informal recycling provides livelihoods for many Chinese citizens and is creating serious environmental and health concerns. Thus, e-waste generation and management in China has remained a major problem and are fuelled by China’s inexpensive labour and manufacturing abilities. Informal recyclers do the majority of e-waste collection and recycling in most cities throughout China [ 50 ].

3.2.3. India

The increasing average annual growth rate from 0.56% in 1991 to 1.62% in 2011 has contributed significantly to an alarming amount of e-waste generation in India. India is among the top 10 countries in the world in e-waste generation after the U.S. and China. It is estimated that three (3) million tons of e-waste were produced in 2018 and is expected to reach five (5) million tons by the end of 2020 [ 51 , 52 , 53 ]. According to the Confederation of Indian Industries, the Indian electronics industry has a market size of approximately USD 65 billion in 2013, and this is expected to reach USD 400 billion by the end of 2020 [ 52 , 54 ].

Today, e-waste in India is a significant waste stream both in terms of volume and toxicity [ 55 ]. Approximately 152 million units of computers will become obsolete in India by the end of 2021 [ 55 , 56 ], creating serious management challenges and environmental/health problems. Each year, India domestically produces approximately 400,000 tons of e-waste [ 24 ]. Thus, India’s e-waste recycling is a market-driven industry [ 55 ] and is dominated by a number of informal actors. About 90% of the e-waste in India is illegally recycled in the informal sector and involves different groups, including women and children [ 57 , 58 ].

The Ministry of Environment and Forests (MoEF) is the national regulator responsible for formulating legislation related to e-waste management and environmental protection. MoEF approves the guidelines for the identification of the various sources of e-waste in India and endorses the procedures for handling e-waste in an appropriate and environmentally friendly manner [ 59 ]. Those involving e-waste are the 2004 “Municipal Solid Waste Management Rules” and the 2008 “Hazardous and Waste Management Rules.” New regulations are classified as the 2010 “E-waste Management and Handling Rules”, which became effective in 2012 [ 60 ]. While there are regulations on e-waste management and disposal in India, no regulation has effectively addressed the e-waste problem in India [ 52 , 58 ]. Currently, the majority of the hazardous materials found in e-waste are covered under “The Hazardous and Waste Management Rules, 2011 and the 2016 E-waste Management and Handling Rules” [ 52 ].

Despite EPR being a major policy approach in both e-waste (Management and Handling) Rules 2011 and E-waste (Management and Handling) Rules 2016, they are not effectively implemented, and this can be attributed to certain peculiarities in India’s e-waste management system [ 51 , 61 ]. For example, due to some financial incentives involved, Indian consumers are willing to sell their obsolete e-waste to the “kawariwalas” (door-to-door scrap collectors). This behaviour is totally different from practices adopted by most developed countries whereby the producers and consumers have to pay “Recycling/Disposal Fee” [ 62 , 63 , 64 ].

3.2.4. Indonesia

Due to substantial growth in the economy coupled with rapid technological developments, e-waste generation in Indonesia has increased considerably [ 28 , 65 ]. In 2016, Indonesia generated 1274 kt of e-waste with a per capita generation of 4.9 kg [ 66 ]. Although e-waste appears as a global issue, it is not a common term for most people in Indonesia [ 67 , 68 ]. In Indonesia, e-waste management is dominated by the informal recycling sector, which is essentially made of unregulated and unregistered small businesses, groups, and individuals, while the formal sector consists of the country’s municipal agencies as the major actors [ 69 ].

Although the country has no presence of a specific regulation to manage its e-waste, the “Environmental Protection and Management Act No. 32/2009” and “Solid Waste Management Act No. 18/1999” are used in the regulation of e-waste produced in the country [ 70 , 71 ]. Since 2016, the Indonesian government has been in the process of formulating a unified e-waste regulation for the country, which would apply to all the 37 Indonesian provinces, but this is yet to be realised [ 28 , 72 ]. However, the absence of regulated licensed recycling companies in the country has encouraged inappropriate disposal of the majority of the EEE from households, businesses, and industries [ 71 ]. Currently, the informal sector illegally collects, treats, and disposes of discarded EEE triggering huge environmental and health concerns [ 65 , 72 ]. The difficulties/challenges in managing e-waste in Indonesia is primarily due to (a) the inability of the government to understand and deal with the interest of stakeholders involved, (b) the government regulations are beneficial to only a few parties, and (c) there is strong resistance between the government agencies [ 73 ].

3.2.5. Malaysia

In 2019, the International Monetary Fund (IMF), in its economic outlook, ranked Malaysia as the 3rd largest economy in Southeast Asia and the 37th largest economy in the world [ 74 ]. With a healthy economic indicator, e-waste generation in Malaysia is expected to increase in the coming years. The growth in e-waste generation is anticipated worldwide because there is a strong correlation between economic growth and e-waste generation [ 75 , 76 ].

Management of e-waste in Malaysia is still in its infancy and only began in 2005 [ 77 ]. In Malaysia, e-waste is classified as scheduled waste under the code SW 110, “Environmental Quality Regulations 2005” and managed by the Department of Environment (DOE) and the Ministry of Natural Resources and Environment (MNRE) [ 78 , 79 ]. The primary role of DOE and MNRE is pollution prevention and control through the enforcement of the “Environmental Quality Act 1974” (EQA 1974) [ 79 , 80 ]. Although there are strategies on e-waste management in place, they do not adequately guide the local consumers or the municipal authorities on how e-waste should be managed, reused, recycled, or disposed of [ 78 ]. Subsequent to the listing as e-waste under the “Environmental Quality Scheduled Waste Regulations (EQSWR) 2005”, e-waste in Malaysia was reported and managed as municipal solid waste through the Department of Solid Waste Management (DSWM) under the Ministry of Housing and Local Government [ 78 , 81 , 82 ].

3.3. A Review of Previous Studies

This study considered literature reviews to identify key issues associated with e-waste management and to conduct an extensive evaluation of e-waste management practices in the selected countries. We believe this knowledge will help the countries to overcome their challenges and develop appropriate strategies for recycling and disposing of e-waste. This section provides an overview of earlier studies in the selected countries. In particular, results from the literature review on e-waste generation and management practices adopted by the respective nations are presented. Furthermore, this section presents the scope and the context of earlier studies on e-waste management. Prior studies [ 83 , 84 , 85 , 86 ] offer valuable insights into e-waste management in the selected countries. They also highlight the challenges associated with e-waste management and the need for developing comprehensive e-waste management strategies. Table 4 presents previous research on e-waste conducted in the selected countries from 2005 to 2020.

Previous studies on e-waste conducted in the selected countries from 2005 to 2020.

4. Results and Discussion

This study adopts a qualitative approach for studying e-waste management practices of the selected countries in the Asia Pacific region. As per Wolfswinkel et al. [ 32 ], this study adopted a five-phase approach. In the first phase, secondary data from 2005 to 2020 has been considered for reviewing existing literature on e-waste management in the selected countries. Then, a total of eight (8) keywords are used to identify and analyse the relevant articles. Finally, challenges and practices associated with e-waste management are discussed to present the proposed policy approaches and recommendations.

E-waste management has become a contentious issue due to the presence of hazardous materials and the health hazards it may cause if not managed properly. In fact, for more than a decade, scholars have conducted studies on informal e-waste collection and disposal methods [ 87 , 88 ]. However, these studies were limited to e-waste generation, prevention, quantification, recycling, treatment, reuse, pollution control, legislation, and life-cycle assessment, as noted in recent studies [ 83 , 85 , 87 , 89 , 90 , 91 ]. Undoubtedly, these studies presented opportunities to address some of the challenges associated with e-waste management. However, there is a limited study in addressing the environmental and health implications associated with e-waste for achieving sustainable e-waste management. Moreover, prior studies on e-waste are centred on a small number of developed countries, which represent a “standard” or “benchmark” for developing e-waste management policies for emerging countries. Therefore, this study aims to address these gaps.

4.1. E-Waste Studies in Selected Countries

After a critical review of the pertinent literature and a content analysis of the e-waste articles related to the selected countries, the dispersion of e-waste research in the selected countries according to the keywords/themes, e-waste categories examined, and the study location are illustrated in Table 5 . Based on the information presented in Table 5 , it is evident that most of the e-waste studies in the selected countries were focused on e-waste generation, management and recycling. A number of e-waste studies focused on problems and challenges, environmental management, and health impacts indicating that further research is required in these areas in the countries examined.

Distribution of e-waste research in selected countries.

4.2. Analysis of Content Results

Given the background review and analysis in the previous sections, it is obvious that the problem and challenges of e-waste in the selected countries still persist. Our analysis shows that the e-waste management systems and infrastructure of the selected countries, particularly India, China, Malaysia, and Indonesia, are still in their infancy. Currently, e-waste scrap such as printed circuit boards, CRT monitors, and LCD screens have been, and are still being, recycled in China, India, Indonesia, and Malaysia, creating huge environmental and health issues. Informal e-waste collection, recycling, and its health implications on informal workers in these countries have become increasingly popular in the last 15 years [ 89 , 92 , 93 , 94 ]. Table 6 shows the findings from the analysis of the contents.

Findings from the analysis of the contents.

In China, several towns have remained as a dumping ground for e-waste. For example, Guiyu town is often referred to as “the e-waste capital of the world” and employs more than 150,000 locals from four villages. These local informal workers dismantle and recapture valuable metals and parts that can be reused or sold from old computers. In Guiyu, it is not uncommon to see computer parts, cables, and huge tangles of wires scattered around the streets and riverbanks [ 88 , 95 , 96 , 97 ]. Findings/outcomes indicate that various issues geared towards developing a sustainable recycling system still need to be addressed.

In India, obsolete computers from households and businesses are sold by auction to door-to-door collectors who engage in informal methods of recycling. According to a report by the Confederation of Indian Industries (CII), approximately 146,000 tons of obsolete EEE are generated in India annually [ 86 , 109 ]. The results of the analysis show that the recycling of e-waste in India is heavily dominated by the informal sector, and only a few approved e-waste recycling facilities are available. In the majority of urban slums of India, more than 95% of e-waste is treated and processed by untrained workers who carry out illegal and risky procedures. These illegal procedures are not only injurious to the health of the locals who work without personal protective equipment but also to the environment [ 55 , 86 ]. It is found that the formal process of e-waste recycling and treatment is still rather slow as the collection and recycling of most e-waste remains in the hands of the informal sector [ 86 , 109 ].

In Indonesia, large amounts of e-waste are imported from developed countries. E-waste in the form of scrap materials or second-hand devices is sent to Indonesian islands from the adjacent ports in Singapore and Malaysia. Findings indicate that, in Indonesia, infrastructure and workable systems to quantify, recycle, monitor, and handle e-waste is lacking [ 65 , 127 ]. Currently, the informal sector illegally collects, treats, and disposes of discarded EEE, causing huge environmental and health issues [ 65 , 71 ].

The management of e-waste in Malaysia is still developing and only began in 2005 [ 77 ]. Results indicate that although there are strategies to manage e-waste in Malaysia, challenges persist and the pressure to manage e-waste is now even more crucial. Malaysia has become one of the popular destinations of e-waste imported from developed countries [ 139 , 140 , 141 ]. Results of the analysis also indicate the country still faces significant issues in managing the ever-increasing amount of e-waste generated even though several material recovery facilities (MFR) have been established.

In Australia, several government policies have been developed. The key issues are identified in the e-waste management including: (a) the narrow scope of e-waste categories for recycling, (b) the lack of clarity on the roles of key stakeholders involved, (c) the recycling and material recovery targets, and (d) the lack of auditing and compliance. The results of the analysis show [ 47 , 142 , 143 ] minimal research has been undertaken to assess the effectiveness of e-waste policy management strategies [ 47 , 144 , 145 , 146 , 147 ].

It can be seen that the majority of the selected countries in this present study are faced with an increasing amount of e-waste. Although the per capita e-waste generated in the emerging countries is much lesser than in the developing countries, the volume generated is greater due to the growing population and market size in emerging countries such as India, China, and Indonesia. These countries are ranked among the top e-waste generators in the world.

The importance of selecting these countries such as Australia, India, China, Indonesia, and Malaysia in the Asia Pacific region in terms of environmental and market perspectives cannot be overemphasised. These selected countries have significant population, natural resources, and financial potentials [ 67 , 148 , 149 , 150 , 151 ]. Moreover, these countries have contributed substantially to the world’s GDP, landmass, and market share. This calls for a responsible e-waste management effort by these countries to effectively manage the growing amounts of e-waste generated for reducing environmental and health concerns.

Clearly, e-waste management processes in the majority of these countries examined still need improvement. Most of these countries studied have no well-established e-waste infrastructure for efficient collection, storage, transportation, recycling, and disposal of e-waste. In addition, the enforcement of codes of practice and regulations relating to hazardous e-waste management in these countries is minimal or non-existent.

Exposure to e-waste is harmful to public health. E-waste has been found to negatively impact public health because communities are exposed to a complex mixture of chemicals from multiple sources and through multiple exposure routes [ 152 ]. The results of this study indicate that the impact of e-waste is linked to a variety of health problems in the countries examined, such as birth defects, premature births, respiratory diseases, and cancer. Furthermore, people living in e-waste recycling towns or working in e-waste recycling sites showed evidence of greater DNA damage. A review of the literature also revealed an association between e-waste exposure and thyroid dysfunction, adverse behavioural changes, and damage to the lungs, heart, and spleen due to prolonged exposure [ 152 , 153 ].

Hence, e-waste has become one of the major challenges in these countries, and it is, therefore, crucial for these countries to investigate the development of a well-organised and inexpensive recycling scheme to extract valuable resources with inconsequential environmental impacts.

5. Conclusions

This study has evaluated the e-waste generation and management practices of the selected countries in the Asia Pacific region. Based on the review of past studies and results of the analysis, it is obvious that the majority of the selected countries are yet to find a workable e-waste management strategy that will provide a sustainable solution to their e-waste concerns.

Results of the analysis show that the volumes of e-waste generated are fast exceeding the available infrastructure and recycling facilities in the countries examined, thereby driving e-waste streams to flow into illegal and informal recovery. On top of that, the absence of an integrated framework that could support the monitoring and management of toxic and hazardous wastes has also created additional problems in managing e-waste in the selected countries and calls for a generic e-waste policy approach.

In addition, the increasing demand for second-hand EEE, particularly in developing countries (China, Indonesia, India, and Malaysia) due to poverty and the continuing technological modernisation, has made these countries dumping grounds for e-waste from developed countries. For example, China’s Guiyu town is well-known for the informal recycling of printed circuit boards. Specifically, “metal-contaminated sediments and elevated levels of dissolved metals have been reported in rivers around the town of Guiyu” [ 85 ].

Furthermore, sophisticated facilities and infrastructure required for formal recycling of e-waste using efficient technologies are minimal or non-existent in the selected countries. Formal recycling is widely accepted as the best way to manage e-waste, which reduces greenhouse gas emissions and helps lessen the climate crisis. Thus, recycling e-waste will reduce air and water pollution associated with the illegal dumping of e-waste. By recycling discarded, unwanted, or obsolete EEE for new products, nations can further reduce the enormous health risks and environmental pollution associated with improper disposal of e-waste.

Therefore, to effectively manage e-waste in the selected countries, there is a need to develop generic structured policy approaches to tackle the e-waste problem in the selected countries and indeed across the world is required. These structured policies are projected to put in place formal systems and infrastructure for the recycling, management, and disposal of e-waste, taking into account country-specific issues.

One of the shortcomings of this study is that the information and analysis of previous studies are seen to be reality. This study is also limited to countries in the Asia Pacific region and considers the time limitation by the year of the articles found. Although the accuracy of some of the analyses in the present study is inescapably subjective, this study is a starting point for further research into various aspects of e-waste generation and management practices of the selected countries.

6. Recommendations

This study has exposed the current situation of e-waste generation and management practices of the selected countries. The following recommendations are suggested based on the findings of this study:

• E-waste regulations tailored to each country’s current situations should be enacted, recognising the lessons learned from more developed and experienced nations such as Japan, Switzerland, and South Korea;
• Extended producer responsibility (EPR) and 3Rs strategy should be implemented in EEE manufacturing regulations in all countries to support the production of simple, lightweight products, planned for reuse rather than obsolescence so that recycled materials can become resources for new products, thereby reducing the request for raw materials;
• Local government councils are key stakeholders in the management and recycling process and therefore incur major expenditures while handling e-waste. This, therefore, necessitates policymakers understanding of the determinants, drivers, and costs associated with e-waste collection and disposal;
• International integrated organisations should be established for checking specific e-waste material generation across the globe. This initiative will restrain the transboundary movement of e-waste across international borders.

Policy Approaches

Although different countries have endorsed and passed their respective e-waste regulations in other to manage e-waste, implementing appropriate and structured policy approaches will support all efforts directed towards effectively managing e-waste across the globe. Firstly, it is critical to have stepwise, and well-thought-out policy approaches for effectively formulating and implementing e-waste regulations and guidelines. Such approaches have been found to be effective in more advanced countries such as Switzerland, South Korea, and Japan, as noted above. In view of the multidimensional socio-economic nature of emerging economies, it is vital to consistently assess and evaluate existing policies to identify gaps and areas for improvement. This technique has also been found to be effective in Australia. Secondly, when implementing e-waste policies, interdisciplinary research approaches need to be considered. This will allow policymakers to better understand and address the various health and environmental problems associated with e-waste management. Finally, we believe that the policy approaches of respective countries geared towards dealing with the persistent and challenging e-waste issues require a local and specific approach where inherent socio-cultural, economic, political, and environmental concerns of that country are taken into consideration.

7. Future Research

Future research should use a quantitative approach or other research methods and expand the number of selected countries to understand e-waste generation and management practices of countries in the Asia Pacific region. This will provide additional viewpoints in the management, recycling, and environmental management of e-waste in the regions.

Author Contributions

L.A.: Conceptualisation, Methodology, Formal analysis, Investigation, Resources, Writing—Original Draft; S.W.: Visualisation, Validation, Writing—Review and Editing, Supervision; S.G.: Visualisation, Validation, Writing—Review and Editing, Supervision. All authors have read and agreed to the published version of the manuscript.

This research received no external funding.

Institutional Review Board Statement

Informed consent statement, data availability statement, conflicts of interest.

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Research Topics & Ideas: Environment

100+ Environmental Science Research Topics & Ideas

Finding and choosing a strong research topic is the critical first step when it comes to crafting a high-quality dissertation, thesis or research project. Here, we’ll explore a variety research ideas and topic thought-starters related to various environmental science disciplines, including ecology, oceanography, hydrology, geology, soil science, environmental chemistry, environmental economics, and environmental ethics.

NB – This is just the start…

The topic ideation and evaluation process has multiple steps . In this post, we’ll kickstart the process by sharing some research topic ideas within the environmental sciences. This is the starting point though. To develop a well-defined research topic, you’ll need to identify a clear and convincing research gap , along with a well-justified plan of action to fill that gap.

If you’re new to the oftentimes perplexing world of research, or if this is your first time undertaking a formal academic research project, be sure to check out our free dissertation mini-course. Also be sure to also sign up for our free webinar that explores how to develop a high-quality research topic from scratch.

Overview: Environmental Topics

• Ecology /ecological science
• Atmospheric science
• Oceanography
• Soil science
• Environmental chemistry
• Environmental economics
• Environmental ethics
• Examples  of dissertations and theses

Topics & Ideas: Ecological Science

• The impact of land-use change on species diversity and ecosystem functioning in agricultural landscapes
• The role of disturbances such as fire and drought in shaping arid ecosystems
• The impact of climate change on the distribution of migratory marine species
• Investigating the role of mutualistic plant-insect relationships in maintaining ecosystem stability
• The effects of invasive plant species on ecosystem structure and function
• The impact of habitat fragmentation caused by road construction on species diversity and population dynamics in the tropics
• The role of ecosystem services in urban areas and their economic value to a developing nation
• The effectiveness of different grassland restoration techniques in degraded ecosystems
• The impact of land-use change through agriculture and urbanisation on soil microbial communities in a temperate environment
• The role of microbial diversity in ecosystem health and nutrient cycling in an African savannah

Topics & Ideas: Atmospheric Science

• The impact of climate change on atmospheric circulation patterns above tropical rainforests
• The role of atmospheric aerosols in cloud formation and precipitation above cities with high pollution levels
• The impact of agricultural land-use change on global atmospheric composition
• Investigating the role of atmospheric convection in severe weather events in the tropics
• The impact of urbanisation on regional and global atmospheric ozone levels
• The impact of sea surface temperature on atmospheric circulation and tropical cyclones
• The impact of solar flares on the Earth’s atmospheric composition
• The impact of climate change on atmospheric turbulence and air transportation safety
• The impact of stratospheric ozone depletion on atmospheric circulation and climate change
• The role of atmospheric rivers in global water supply and sea-ice formation

Topics & Ideas: Oceanography

• The impact of ocean acidification on kelp forests and biogeochemical cycles
• The role of ocean currents in distributing heat and regulating desert rain
• The impact of carbon monoxide pollution on ocean chemistry and biogeochemical cycles
• Investigating the role of ocean mixing in regulating coastal climates
• The impact of sea level rise on the resource availability of low-income coastal communities
• The impact of ocean warming on the distribution and migration patterns of marine mammals
• The impact of ocean deoxygenation on biogeochemical cycles in the arctic
• The role of ocean-atmosphere interactions in regulating rainfall in arid regions
• The impact of ocean eddies on global ocean circulation and plankton distribution
• The role of ocean-ice interactions in regulating the Earth’s climate and sea level

Tops & Ideas: Hydrology

• The impact of agricultural land-use change on water resources and hydrologic cycles in temperate regions
• The impact of agricultural groundwater availability on irrigation practices in the global south
• The impact of rising sea-surface temperatures on global precipitation patterns and water availability
• Investigating the role of wetlands in regulating water resources for riparian forests
• The impact of tropical ranches on river and stream ecosystems and water quality
• The impact of urbanisation on regional and local hydrologic cycles and water resources for agriculture
• The role of snow cover and mountain hydrology in regulating regional agricultural water resources
• The impact of drought on food security in arid and semi-arid regions
• The role of groundwater recharge in sustaining water resources in arid and semi-arid environments
• The impact of sea level rise on coastal hydrology and the quality of water resources

Topics & Ideas: Geology

• The impact of tectonic activity on the East African rift valley
• The role of mineral deposits in shaping ancient human societies
• The impact of sea-level rise on coastal geomorphology and shoreline evolution
• Investigating the role of erosion in shaping the landscape and impacting desertification
• The impact of mining on soil stability and landslide potential
• The impact of volcanic activity on incoming solar radiation and climate
• The role of geothermal energy in decarbonising the energy mix of megacities
• The impact of Earth’s magnetic field on geological processes and solar wind
• The impact of plate tectonics on the evolution of mammals
• The role of the distribution of mineral resources in shaping human societies and economies, with emphasis on sustainability

Topics & Ideas: Soil Science

• The impact of dam building on soil quality and fertility
• The role of soil organic matter in regulating nutrient cycles in agricultural land
• The impact of climate change on soil erosion and soil organic carbon storage in peatlands
• Investigating the role of above-below-ground interactions in nutrient cycling and soil health
• The impact of deforestation on soil degradation and soil fertility
• The role of soil texture and structure in regulating water and nutrient availability in boreal forests
• The impact of sustainable land management practices on soil health and soil organic matter
• The impact of wetland modification on soil structure and function
• The role of soil-atmosphere exchange and carbon sequestration in regulating regional and global climate
• The impact of salinization on soil health and crop productivity in coastal communities

Topics & Ideas: Environmental Chemistry

• The impact of cobalt mining on water quality and the fate of contaminants in the environment
• The role of atmospheric chemistry in shaping air quality and climate change
• The impact of soil chemistry on nutrient availability and plant growth in wheat monoculture
• Investigating the fate and transport of heavy metal contaminants in the environment
• The impact of climate change on biochemical cycling in tropical rainforests
• The impact of various types of land-use change on biochemical cycling
• The role of soil microbes in mediating contaminant degradation in the environment
• The impact of chemical and oil spills on freshwater and soil chemistry
• The role of atmospheric nitrogen deposition in shaping water and soil chemistry
• The impact of over-irrigation on the cycling and fate of persistent organic pollutants in the environment

Topics & Ideas: Environmental Economics

• The impact of climate change on the economies of developing nations
• The role of market-based mechanisms in promoting sustainable use of forest resources
• The impact of environmental regulations on economic growth and competitiveness
• Investigating the economic benefits and costs of ecosystem services for African countries
• The impact of renewable energy policies on regional and global energy markets
• The role of water markets in promoting sustainable water use in southern Africa
• The impact of land-use change in rural areas on regional and global economies
• The impact of environmental disasters on local and national economies
• The role of green technologies and innovation in shaping the zero-carbon transition and the knock-on effects for local economies
• The impact of environmental and natural resource policies on income distribution and poverty of rural communities

Topics & Ideas: Environmental Ethics

• The ethical foundations of environmentalism and the environmental movement regarding renewable energy
• The role of values and ethics in shaping environmental policy and decision-making in the mining industry
• The impact of cultural and religious beliefs on environmental attitudes and behaviours in first world countries
• Investigating the ethics of biodiversity conservation and the protection of endangered species in palm oil plantations
• The ethical implications of sea-level rise for future generations and vulnerable coastal populations
• The role of ethical considerations in shaping sustainable use of natural forest resources
• The impact of environmental justice on marginalized communities and environmental policies in Asia
• The ethical implications of environmental risks and decision-making under uncertainty
• The role of ethics in shaping the transition to a low-carbon, sustainable future for the construction industry
• The impact of environmental values on consumer behaviour and the marketplace: a case study of the ‘bring your own shopping bag’ policy

Examples: Real Dissertation & Thesis Topics

While the ideas we’ve presented above are a decent starting point for finding a research topic, they are fairly generic and non-specific. So, it helps to look at actual dissertations and theses to see how this all comes together.

Below, we’ve included a selection of research projects from various environmental science-related degree programs to help refine your thinking. These are actual dissertations and theses, written as part of Master’s and PhD-level programs, so they can provide some useful insight as to what a research topic looks like in practice.

• The physiology of microorganisms in enhanced biological phosphorous removal (Saunders, 2014)
• The influence of the coastal front on heavy rainfall events along the east coast (Henson, 2019)
• Forage production and diversification for climate-smart tropical and temperate silvopastures (Dibala, 2019)
• Advancing spectral induced polarization for near surface geophysical characterization (Wang, 2021)
• Assessment of Chromophoric Dissolved Organic Matter and Thamnocephalus platyurus as Tools to Monitor Cyanobacterial Bloom Development and Toxicity (Hipsher, 2019)
• Evaluating the Removal of Microcystin Variants with Powdered Activated Carbon (Juang, 2020)
• The effect of hydrological restoration on nutrient concentrations, macroinvertebrate communities, and amphibian populations in Lake Erie coastal wetlands (Berg, 2019)
• Utilizing hydrologic soil grouping to estimate corn nitrogen rate recommendations (Bean, 2019)
• Fungal Function in House Dust and Dust from the International Space Station (Bope, 2021)
• Assessing Vulnerability and the Potential for Ecosystem-based Adaptation (EbA) in Sudan’s Blue Nile Basin (Mohamed, 2022)
• A Microbial Water Quality Analysis of the Recreational Zones in the Los Angeles River of Elysian Valley, CA (Nguyen, 2019)
• Dry Season Water Quality Study on Three Recreational Sites in the San Gabriel Mountains (Vallejo, 2019)
• Wastewater Treatment Plan for Unix Packaging Adjustment of the Potential Hydrogen (PH) Evaluation of Enzymatic Activity After the Addition of Cycle Disgestase Enzyme (Miessi, 2020)
• Laying the Genetic Foundation for the Conservation of Longhorn Fairy Shrimp (Kyle, 2021).

Looking at these titles, you can probably pick up that the research topics here are quite specific and narrowly-focused , compared to the generic ones presented earlier. To create a top-notch research topic, you will need to be precise and target a specific context with specific variables of interest . In other words, you’ll need to identify a clear, well-justified research gap.

Need more help?

If you’re still feeling a bit unsure about how to find a research topic for your environmental science dissertation or research project, be sure to check out our private coaching services below, as well as our Research Topic Kickstarter .

Need a helping hand?

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EDITORIAL article

This article is part of the research topic.

Women in Biogeochemical Dynamics Research: 2022

Editorial Frontiers in Environmental Science "Women in Biogeochemical Dynamics Research" Provisionally Accepted

• 1 Université de Reims Champagne-Ardenne, France
• 2 Institute of Marine Sciences, Spanish National Research Council (CSIC), Spain

The final, formatted version of the article will be published soon.

At present, less than 30% of researchers worldwide are women. Long-standing biases and gender stereotypes are discouraging girls and women away from science-related fields, and STEM research in particular. Science and gender equality are, however, essential to ensure sustainable development as highlighted by UNESCO. In order to change traditional mindsets, gender equality must be promoted, stereotypes defeated, and girls and women should be encouraged to pursue STEM careers.Therefore, we are proud to offer this platform in Frontiers in Environmental Science to promote the work of women scientists. To be considered for this collection, the first, last, or corresponding author should be a researcher who identifies as a woman The papers presented here highlight the diversity of research performed across the entire breadth of Biogeochemical Dynamics research and the advances in theory, experiment, and methodology with applications to compelling problems. Contributions to this journal showcase the breadth and depth of investigations aimed at understanding and mitigating human impacts on our planet.One significant study by Chua and Fulweiler (2023) highlights the importance of hightemporal-resolution gas concentration measurements in capturing the rapid response of sediments to low-oxygen conditions. This research sheds light on the dynamic nature of sedimentary processes and underscores the necessity of precise monitoring techniques in studying environmental phenomena.In another investigation, Forsyth et al. (2023) delve into the bioconcentration and translocation of rare earth elements in plants from legacy mine sites in Portugal. Their findings not only contribute to our understanding of plant-metal interactions but also have implications for environmental management strategies in areas affected by mining activities.Meanwhile, Ismail and Al-Shehhi (2023) offer a comprehensive review of biogeochemical models' applications in various marine environments. By synthesizing existing knowledge, the authors provide valuable insights into the role of these models in elucidating complex biogeochemical processes and guiding sustainable marine resource management practices. Lavergne et al. (2024) draw attention to the importance of conserving microorganisms in terrestrial ecosystems, focusing on soil microbial diversity in Chile and the Antarctic Peninsula. Their work underscores the need for heightened awareness and proactive conservation efforts to safeguard these essential components of ecosystem functioning.In a study with implications for land management practices, Rissanen et al. (2023) investigate the vegetation impacts on methane emissions from boreal forestry-drained peatlands. Their findings highlight the role of moss cover in modulating emissions and emphasize the importance of considering vegetation dynamics in peatland management strategies.Addressing the pervasive issue of plastic pollution in marine environments, Romera-Castillo et al. ( 2022) quantify the leaching of dissolved organic matter from aged plastic and its impact on microbial activity. This research underscores the urgent need to mitigate plastic pollution and its cascading effects on marine ecosystems. Furthermore, Santos et al. (2022) employ leaf wax biomarkers to reconstruct environmental conditions in a high-mountain lake area in western Iberia. Their work illustrates the utility of biomarker analysis in paleoenvironmental reconstructions and contributes to our understanding of past environmental changes. Sun et al. (2023) investigate the release of inorganic mercury and subsequent methylmercury production in boreal peatlands due to ground warming. Their findings underscore the complex interactions between climate change and mercury cycling in peatland ecosystems, highlighting the need for integrated approaches to mitigate mercury pollution.Lastly, Vila-Costa et al. (2023) data represent a significant step forward in unraveling the intricate interactions between pelagic marine bacteria and organic pollutants. By conducting comprehensive field studies in the tropical Pacific and subtropical Atlantic Oceans, the researchers provide invaluable insights into the responses of these bacteria to various pollutants.Collectively, these studies exemplify the diverse and interdisciplinary nature of research featured by women in Environmental Science. By advancing our understanding of environmental processes and informing evidence-based management strategies, these contributions play a crucial role in addressing the myriad challenges facing our planet. As we navigate the complexities of the Anthropocene, women scientists are at the forefront of fostering dialogue and innovation to promote environmental sustainability and stewardship. In the realm of biogeochemical dynamics research, women scientists have long been making significant contributions, yet their achievements and perspectives are sometimes overlooked or underrepresented. As we strive for inclusivity and diversity in the scientific community, it's imperative to shine a spotlight on the invaluable work of women researchers in this field. It's essential to amplify their voices, recognize their contributions, and support their career advancement. By fostering an inclusive and supportive environment that values diversity, we can harness the full potential of women scientists and unlock new insights into the complex dynamics of our planet's biogeochemical cycles. In conclusion, women scientists are driving innovation, discovery, and progress in biogeochemical dynamics research. Their expertise, leadership, and dedication are indispensable assets in tackling the environmental challenges of the 21st century. Let us continue to celebrate and uplift the contributions of women in science, paving the way for a more equitable and sustainable future.

Keywords: women in STEM, environmental science, Biogeochemical Dynamics Research, Gender Equality, Diversity in Science

Received: 09 Apr 2024; Accepted: 11 Apr 2024.

Copyright: © 2024 Cosio, Bravo and Sebastian. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY) . The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

* Correspondence: Mx. Claudia Cosio, Université de Reims Champagne-Ardenne, Reims, France

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There’s an Explosion of Plastic Waste. Big Companies Say ‘We’ve Got This.’

Big brands like Procter & Gamble and Nestlé say a new generation of plants will help them meet environmental goals, but the technology is struggling to deliver.

Recycled polypropylene pellets at a PureCycle Technologies plant in Ironton, Ohio. Credit... Maddie McGarvey for The New York Times

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By Hiroko Tabuchi

• Published April 5, 2024 Updated April 8, 2024

By 2025, Nestle promises not to use any plastic in its products that isn’t recyclable. By that same year, L’Oreal says all of its packaging will be “refillable, reusable, recyclable or compostable.”

And by 2030, Procter & Gamble pledges that it will halve its use of virgin plastic resin made from petroleum.

To get there, these companies and others are promoting a new generation of recycling plants, called “advanced” or “chemical” recycling, that promise to recycle many more products than can be recycled today.

So far, advanced recycling is struggling to deliver on its promise. Nevertheless, the new technology is being hailed by the plastics industry as a solution to an exploding global waste problem.

The traditional approach to recycling is to simply grind up and melt plastic waste. The new, advanced-recycling operators say they can break down the plastic much further, into more basic molecular building blocks, and transform it into new plastic.

PureCycle Technologies, a company that features prominently in Nestlé, L’Oréal, and Procter & Gamble’s plastics commitments, runs one such facility, a $500 million plant in Ironton, Ohio. The plant was originally to start operating in 2020 , with the capacity to process as much as 182 tons of discarded polypropylene, a hard-to-recycle plastic used widely in single-use cups, yogurt tubs, coffee pods and clothing fibers, every day.

But PureCycle’s recent months have instead been filled with setbacks: technical issues at the plant, shareholder lawsuits, questions over the technology and a startling report from contrarian investors who make money when a stock price falls. They said that they had flown a drone over the facility that showed that the plant was far from being able to make much new plastic.

PureCycle, based in Orlando, Fla., said it remained on track. “We’re ramping up production,” its chief executive, Dustin Olson, said during a recent tour of the plant, a constellation of pipes, storage tanks and cooling towers in Ironton, near the Ohio River. “We believe in this technology. We’ve seen it work,” he said. “We’re making leaps and bounds.”

Nestlé, Procter & Gamble and L’Oréal have also expressed confidence in PureCycle. L’Oréal said PureCycle was one of many partners developing a range of recycling technologies. P.&G. said it hoped to use the recycled plastic for “numerous packaging applications as they scale up production.” Nestlé didn’t respond to requests for comment, but has said it is collaborating with PureCycle on “groundbreaking recycling technologies.”

PureCycle’s woes are emblematic of broad trouble faced by a new generation of recycling plants that have struggled to keep up with the growing tide of global plastic production, which scientists say could almost quadruple by midcentury .

A chemical-recycling facility in Tigard, Ore., a joint venture between Agilyx and Americas Styrenics, is in the process of shutting down after millions of dollars in losses. A plant in Ashley, Ind., that had aimed to recycle 100,000 tons of plastic a year by 2021 had processed only 2,000 tons in total as of late 2023, after fires, oil spills and worker safety complaints.

At the same time, many of the new generation of recycling facilities are turning plastic into fuel, something the Environmental Protection Agency doesn’t consider to be recycling, though industry groups say some of that fuel can be turned into new plastic .

Overall, the advanced recycling plants are struggling to make a dent in the roughly 36 million tons of plastic Americans discard each year, which is more than any other country. Even if the 10 remaining chemical-recycling plants in America were to operate at full capacity, they would together process some 456,000 tons of plastic waste, according to a recent tally by Beyond Plastics , a nonprofit group that advocates stricter controls on plastics production. That’s perhaps enough to raise the plastic recycling rate — which has languished below 10 percent for decades — by a single percentage point.

For households, that has meant that much of the plastic they put out for recycling doesn’t get recycled at all, but ends up in landfills. Figuring out which plastics are recyclable and which aren’t has turned into, essentially, a guessing game . That confusion has led to a stream of non-recyclable trash contaminating the recycling process, gumming up the system.

“The industry is trying to say they have a solution,” said Terrence J. Collins, a professor of chemistry and sustainability science at Carnegie Mellon University. “It’s a non-solution.”

‘Molecular washing machine’

It was a long-awaited day last June at PureCycle’s Ironton facility: The company had just produced its first batch of what it describes as “ultra-pure” recycled polypropylene pellets.

That milestone came several years late and with more than $350 million in cost overruns. Still, the company appeared to have finally made it. “Nobody else can do this,” Jeff Kramer, the plant manager, told a local news crew .

PureCycle had done it by licensing a game-changing method — developed by Procter & Gamble researchers in the mid-2010s, but unproven at scale — that uses solvent to dissolve and purify the plastic to make it new again. “It’s like a molecular washing machine,” Mr. Olson said.

There’s a reason Procter & Gamble, Nestlé and L’Oréal, some of the world’s biggest users of plastic, are excited about the technology. Many of their products are made from polypropylene, a plastic that they transform into a plethora of products using dyes and fillers. P.&G. has said it uses more polypropylene than any other plastic, more than a half-million tons a year.

But those additives make recycling polypropylene more difficult.

The E.P.A. estimates that 2.7 percent of polypropylene packaging is reprocessed. But PureCycle was promising to take any polypropylene — disposable beer cups, car bumpers, even campaign signs — and remove the colors, odors, and contaminants to transform it into new plastic.

Soon after the June milestone, trouble hit.

On Sept. 13, PureCycle disclosed that its plant had suffered a power failure the previous month that had halted operations and caused a vital seal to fail. That meant the company would be unable to meet key milestones, it told lenders.

Then in November, Bleecker Street Research — a New York-based short-seller, an investment strategy that involves betting that a company’s stock price will fall — published a report asserting that the white pellets that had rolled off PureCycle’s line in June weren’t recycled from plastic waste. The short-sellers instead claimed that the company had simply run virgin polypropylene through the system as part of a demonstration run.

Mr. Olson said PureCycle hadn’t used consumer waste in the June 2023 run, but it hadn’t used virgin plastic, either. Instead it had used scrap known as “post industrial,” which is what’s left over from the manufacturing process and would otherwise go to a landfill, he said.

Bleecker Street also said it had flown heat-sensing drones over the facility and said it found few signs of commercial-scale activity. The firm also raised questions about the solvent PureCycle was using to break down the plastic, calling it “a nightmare concoction” that was difficult to manage.

PureCycle is now being sued by other investors who accuse the company of making false statements and misleading investors about its setbacks.

Mr. Olson declined to describe the solvent. Regulatory filings reviewed by The New York Times indicate that it is butane, a highly flammable gas, stored under pressure. The company’s filing described the risks of explosion, citing a “worst case scenario” that could cause second-degree burns a half-mile away, and said that to mitigate the risk the plant was equipped with sprinklers, gas detectors and alarms.

Chasing the ‘circular economy’

It isn’t unusual, of course, for any new technology or facility to experience hiccups. The plastics industry says these projects, once they get going, will bring the world closer to a “circular” economy, where things are reused again and again.

Plastics-industry lobbying groups are promoting chemical recycling. At a hearing in New York late last year, industry lobbyists pointed to the promise of advanced recycling in opposing a packaging-reduction bill that would eventually mandate a 50 percent reduction in plastic packaging. And at negotiations for a global plastics treaty , lobby groups are urging nations to consider expanding chemical recycling instead of taking steps like restricting plastic production or banning plastic bags.

A spokeswoman for the American Chemistry Council, which represents plastics makers as well as oil and gas companies that produce the building blocks of plastic, said that chemical recycling potentially “complements mechanical recycling, taking the harder-to-recycle plastics that mechanical often cannot.”

Environmental groups say the companies are using a timeworn strategy of promoting recycling as a way to justify selling more plastic, even though the new recycling technology isn’t ready for prime time. Meanwhile, they say, plastic waste chokes rivers and streams, piles up in landfills or is exported .

“These large consumer brand companies, they’re out over their skis,” said Judith Enck, the president of Beyond Plastics and a former regional E.P.A. administrator. “Look behind the curtain, and these facilities aren’t operating at scale, and they aren’t environmentally sustainable,” she said.

The better solution, she said, would be, “We need to make less plastic.”

Touring the plant

Mr. Olson recently strolled through a cavernous warehouse at PureCycle’s Ironton site, built at a former Dow Chemical plant. Since January, he said, PureCycle has been processing mainly consumer plastic waste and has produced about 1.3 million pounds of recycled polypropylene, or about 1 percent of its annual production target.

“This is a bag that would hold dog food,” he said, pointing to a bale of woven plastic bags. “And these are fruit carts that you’d see in street markets. We can recycle all of that, which is pretty cool.”

The plant was dealing with a faulty valve discovered the day before, so no pellets were rolling off the line. Mr. Olson pulled out a cellphone to show a photo of a valve with a dark line ringing its interior. “It’s not supposed to look like that,” he said.

The company later sent video of Mr. Olson next to white pellets once again streaming out of its production line.

PureCycle says every kilogram of polypropylene it recycles emits about 1.54 kilograms of planet-warming carbon dioxide. That’s on par with a commonly used industry measure of emissions for virgin polypropylene. PureCycle said that it was improving on that measure.

Nestlé, L’Oréal and Procter & Gamble continue to say they’re optimistic about the technology. In November, Nestlé said it had invested in a British company that would more easily separate out polypropylene from other plastic waste.

It was “just one of the many steps we are taking on our journey to ensure our packaging doesn’t end up as waste,” the company said.

Hiroko Tabuchi covers the intersection of business and climate for The Times. She has been a journalist for more than 20 years in Tokyo and New York. More about Hiroko Tabuchi

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Have questions about climate change? Our F.A.Q. will tackle your climate questions, big and small .

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Warmer Temperatures Affect Ski Tourism Across the Globe

Published: 4/11/2024 10:00:54 AM

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This year's mild winter has significantly impacted Europe's ski resorts, where declining snow cover due to climate change is disrupting operations. A recent research paper in a leading environmental science journal revealed that without snowmaking,  53% of Europe’s ski resorts would be at very high risk for insufficient snow supply under a 2°C global warming scenario , which jumps to 98% at 4°C warming. Even with snowmaking covering 50% of their pistes , 27% would still be at high risk under a 2°C increase and 71% at 4°C. This highlights the profound threat climate change poses to the ski tourism industry, crucial for the economies of many of Europe's mountain regions .

In America, the story is similar. The climate continues to warm, making winters more unpredictable and shorter and posing a threat to ski resorts that rely on consistent snowfall. Climate change scenarios predict a significant reduction in days suitable for snowfall across top ski towns . For instance, Truckee, California , is projected to lose up to 80% of its sub-freezing days by the end of the century under a high emissions scenario. This represents a stark decline in the historical conditions necessary for natural snowfall, challenging the viability of ski resorts and their contribution to local economies. In turn, the economic repercussions are grave. For instance, in Tahoe, a bad snow season led to a 42% decrease in business for one local store, indicative of the broader financial impact on communities reliant on winter sports tourism. Protect Our Winters, a nonprofit organization, released a report indicating that in low snow years, the industry sees a decrease in economic value of $1 billion and a loss of 17,400 jobs compared to average snow years. This variability in snowfall, and therefore ski visits, underscores the vulnerability of the snow sports industry to climate fluctuations .

Deepening the discussion on the impacts of mild winters, experts consider the broader environmental and ecological consequences beyond the economic downturns. The scarcity of snow not only disrupts winter sports, but also affects water resources critical for drinking, agriculture, and natural ecosystems. Regions accustomed to snowfall rely on the gradual melt to replenish rivers and reservoirs, a cycle increasingly threatened by climate change . To adapt to these changes, some ski resorts and communities are exploring innovative measures. Beyond enhancing snowmaking capabilities, there's a shift towards diversifying winter tourism offerings. Alternative activities such as winter hiking and cultural events are being promoted to attract tourists and sustain local economies year-round, demonstrating a proactive approach to the challenges posed by changing winter landscapes . 

The call for comprehensive climate action is only  growing . Mitigating the effects of climate change and securing a sustainable future for winter sports and local economies requires global efforts to reduce greenhouse gas emissions and invest in renewable energy . The ski industry, alongside communities and policymakers, is pivotal in advocating for and adopting sustainable practices that safeguard our winters for future generations . 

The cultural significance of winter sports extends beyond mere recreation, embodying traditions and community bonds that have developed over generations. The potential loss of these traditions due to climate change not only threatens local economies but also erodes cultural heritage, emphasizing the need for sustainable solutions . In terms of environmental initiatives, many ski resorts are now prioritizing sustainability by adopting renewable energy sources, improving energy efficiency, and engaging in conservation efforts. These actions reflect a growing recognition within the industry of the need to operate in an environmentally responsible manner to ensure long-term sustainability . Education and awareness play a pivotal role in driving climate action. Organizations like Protect Our Winters leverage the influence of athletes and public figures to mobilize communities and policymakers toward reducing carbon footprints and advocating for climate policies. Their work highlights the importance of collective action in addressing the challenges posed by climate change .

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Parkinson's Disease: New theory on the disease's origins and spread

The nose or the gut? For the past two decades, the scientific community has debated the wellspring of the toxic proteins at the source of Parkinson's disease. In 2003, a German pathologist, Heiko Braak, MD, first proposed that the disease begins outside the brain. More recently, Per Borghammer, MD, with Aarhus University Hospital in Denmark, and his colleagues argue that the disease is the result of processes that start in either the brain's smell center (brain-first) or the body's intestinal tract (body-first).

A new hypothesis paper appearing in the Journal of Parkinson's Disease on World Parkinson's Day unites the brain- and body-first models with some of the likely causes of the disease-environmental toxicants that are either inhaled or ingested. The authors of the new study, who include Borghammer, argue that inhalation of certain pesticides, common dry cleaning chemicals, and air pollution predispose to a brain-first model of the disease. Other ingested toxicants, such as tainted food and contaminated drinking water, lead to body-first model of the disease.

"In both the brain-first and body-first scenarios the pathology arises in structures in the body closely connected to the outside world," said Ray Dorsey, MD, a professor of Neurology at the University of Rochester Medical Center and co-author of the piece. "Here we propose that Parkinson's is a systemic disease and that its initial roots likely begin in the nose and in the gut and are tied to environmental factors increasingly recognized as major contributors, if not causes, of the disease. This further reinforces the idea that Parkinson's, the world's fastest growing brain disease, may be fueled by toxicants and is therefore largely preventable."

Different pathways to the brain, different forms of disease

A misfolded protein called alpha-synuclein has been in scientists' sights for the last 25 years as one of the driving forces behind Parkinson's. Over time, the protein accumulates in the brain in clumps, called Lewy bodies, and causes progressive dysfunction and death of many types of nerve cells, including those in the dopamine-producing regions of the brain that control motor function. When first proposed, Braak thought that an unidentified pathogen, such as a virus, may be responsible for the disease.

The new piece argues that toxins encountered in the environment, specifically the dry cleaning and degreasing chemicals trichloroethylene (TCE) and perchloroethylene (PCE), the weed killer paraquat, and air pollution, could be common causes for the formation of toxic alpha-synuclein. TCE and PCE contaminates thousands of former industrial, commercial, and military sites, most notably the Marine Corps base Camp Lejeune, and paraquat is one of the most widely used herbicides in the US, despite being banned for safety concerns in more than 30 countries, including the European Union and China. Air pollution was at toxic levels in nineteenth century London when James Parkinson, whose 269th birthday is celebrated today, first described the condition.

The nose and the gut are lined with a soft permeable tissue, and both have well established connections to the brain. In the brain-first model, the chemicals are inhaled and may enter the brain via the nerve responsible for smell. From the brain's smell center, alpha-synuclein spreads to other parts of the brain principally on one side, including regions with concentrations of dopamine-producing neurons. The death of these cells is a hallmark of Parkinson's disease. The disease may cause asymmetric tremor and slowness in movement and, a slower rate of progression after diagnosis, and only much later, significant cognitive impairment or dementia.

When ingested, the chemicals pass through the lining of the gastrointestinal tract. Initial alpha-synuclein pathology may begin in the gut's own nervous system from where it can spread to both sides of the brain and spinal cord. This body-first pathway is often associated with Lewy body dementia, a disease in the same family as Parkinson's, which is characterized by early constipation and sleep disturbance, followed by more symmetric slowing in movements and earlier dementia, as the disease spreads through both brain hemispheres.

New models to understand and study brain diseases

"These environmental toxicants are widespread and not everyone has Parkinson's disease," said Dorsey. "The timing, dose, and duration of exposure and interactions with genetic and other environmental factors are probably key to determining who ultimately develops Parkinson's. In most instances, these exposures likely occurred years or decades before symptoms develop."

Pointing to a growing body of research linking environmental exposure to Parkinson's disease, the authors believe the new models may enable the scientific community to connect specific exposures to specific forms of the disease. This effort will be aided by increasing public awareness of the adverse health effects of many chemicals in our environment. The authors conclude that their hypothesis "may explain many of the mysteries of Parkinson's disease and open the door toward the ultimate goal-prevention."

In addition to Parkinson's, these models of environmental exposure may advance understanding of how toxicants contribute to other brain disorders, including autism in children, ALS in adults, and Alzheimer's in seniors. Dorsey and his colleagues at the University of Rochester have organized a symposium on the Brain and the Environment in Washington, DC, on May 20 that will examine the role toxicants in our food, water, and air are playing in all these brain diseases.

Additional authors of the hypothesis paper include Briana De Miranda, PhD, with the University of Alabama at Birmingham, and Jacob Horsager, MD, PhD, with Aarhus University Hospital in Denmark.

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Materials provided by University of Rochester Medical Center . Original written by Mark Michaud. Note: Content may be edited for style and length.

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• E. Ray Dorsey, Briana R. De Miranda, Jacob Horsager, Per Borghammer. The Body, the Brain, the Environment, and Parkinson’s Disease . Journal of Parkinson's Disease , 2024; 1 DOI: 10.3233/JPD-240019

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Sustainability assessment of coffee production in Brazil

• Research Article
• Published: 12 September 2022
• Volume 30 , pages 11099–11118, ( 2023 )

Cite this article

• Vagner Piedade Santos 1 ,
• Priscilla Cristina Cabral Ribeiro   ORCID: orcid.org/0000-0003-0824-9268 2 &
• Luciano Brito Rodrigues 3  

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This paper aims to assess the sustainability of coffee production in Brazil by a framework at the farm level. The framework developed comprises four dimensions of sustainability structured from the literature review. Primary data were collected from 20 coffee farms selected from the most producing communities in the Planalto de Vitória da Conquista locality, sited in Centro-Sul Baiano middle region at the Bahia state. The main environmental issues identified related to coffee farmers are inadequate management of water consumption, influenced by the lack of knowledge about irrigation techniques in some cases, and the use of synthetic fertilizers and pesticides. The economic evaluation of the activity revealed a low index of producers belonging to a class organization. In social aspects the issues are low level of technical/technological instruction for coffee producers, temporary workers are often used, the old age of most producers, the lack of family succession for the activity, low incomes, the high number of temporary workers, and the absence of the worker gains. As for the technical dimension, only half of the farmers invest in innovation, which causes high obsolescence of their equipment and machinery and a low participation rate in training courses. In the environmental dimension, the farmers return the packages of pesticides to the stores where they bought them. In the technical dimension, most farmers perform soil analysis. Besides addressing the identified challenges, the initiatives can help achieve the Sustainable Development Goals, especially the 9th, 12th, and 13th.

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Santos, V.P., Ribeiro, P.C.C. & Rodrigues, L.B. Sustainability assessment of coffee production in Brazil. Environ Sci Pollut Res 30 , 11099–11118 (2023). https://doi.org/10.1007/s11356-022-22922-z

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