Plastic pollution is facing new scrutiny as climate change exacerbates its impacts, according to a recent review. Researchers highlight how rising global temperatures are transforming plastics into more widespread and dangerous pollutants.
As plastics degrade into smaller particles, they become more mobile, traveling long distances and causing increased harm when they settle.
Research led by experts at Imperial College London (ICL) cautions that without immediate measures to reduce plastic emissions into ecosystems, the planet could face irreversible ecological harm.
Lead author Frank Kelly remarked, “Plastic pollution and the climate are co-crises that intensify each other. They also have origins – and solutions – in common.” He emphasized the necessity for a global response to prevent further environmental accumulation of plastics.
Climate Accelerates Plastic Fragmentation
The review compiles data on how climate change accelerates plastic degradation. Increased temperatures, humidity, and ultraviolet radiation hasten the breakdown of larger plastic items into microplastics.
Additionally, severe storms and flooding contribute to the further fragmentation of debris, distributing it across various ecosystems.
Plastic production has seen a staggering 200-fold increase since 1950. As manufacturing and climate pressures rise, so does the issue.
This proliferation impacts ecosystems extensively. In aquatic environments, microplastics disrupt nutrient cycles and food webs. On land, they impact soil quality and crop productivity.
At significant concentrations, these particles can affect feeding, reproduction, and behaviors of numerous species.
Microplastics can transport other harmful substances, such as heavy metals and PFAS, while releasing toxic additives like flame retardants.
Microplastics Emerging from Melting Ice
The researchers highlight potential feedback from the cryosphere. As sea ice forms, it captures microplastics, clearing them temporarily from water bodies.
However, as Arctic ice diminishes, these particles may re-enter oceans, compounding existing pollution from rivers and coastlines.
Study co-author Stephanie Wright from ICL noted, “There’s a chance that microplastics – already in every corner of the planet – will have a greater impact on certain species over time.”
“Both the climate crisis and plastic pollution, which come from society’s over-reliance on fossil fuels, could combine to worsen an already stressed environment in the near future,” Wright added.
Threats to Marine Predators
The dual threat of warming and plastic pollution is particularly pronounced in marine environments. Studies reveal that corals, snails, urchins, mussels, and fish face increased challenges under elevated temperatures and acidification when microplastics are present.
Filter feeders can accumulate these particles and transfer them through the food web. For instance, in one study, fish mortality linked to microplastics increased fourfold with rising water temperatures.
Apex predators like killer whales may be particularly at risk, as they accumulate microplastics and associated chemicals over their lifetimes, compounding other stressors.
Guy Woodward from ICL stated, “Apex predators such as orcas could be the canaries in the coal mine, as they may be especially vulnerable to the combined impact of climate change and plastic pollution.”
Rethinking the Plastics Lifecycle
The review calls for essential changes, such as eliminating non-essential single-use plastics, which still account for about a third of production, and limiting virgin plastic production.
The authors advocate for global standards that ensure products are genuinely reusable and recyclable, rather than superficially so.
Julia Fussell from ICL emphasized, “A circular plastics economy is ideal. It must go beyond reduce, reuse, and recycle to include redesign, rethink, refuse, eliminate, innovate, and circulate – shifting away from the current linear take-make-waste model.”
The paper argues for the integration of plastics and climate policies and for coordinated research to understand how warming, chemistry, and biology interact in ecosystems.
Addressing Microplastic Pollution at Its Source
While microplastics are here to stay, impactful policies can shape future outcomes and allow vulnerable species and ecosystems to adapt.
Wright commented, “The future will not be free of plastic, but we can try to limit further microplastic pollution. We need to act now, as the plastic discarded today threatens future global-scale disruption to ecosystems.”
Kelly concluded, “Solutions require systemic change: cutting plastic at source, coordinated global policy such as the UN Global Plastics Treaty, and responsible, evidence-based innovation in materials and waste management.”
The study is available in the journal Frontiers in Science.
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Original Story at www.earth.com