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The plastic-carbon-climate nexus: Carbon sequestration, microbial adaptation, and land use solutions for a warming microplastics-contaminated world
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Microplastics are piling up in soil worldwide, and this review of existing research shows they're disrupting how soil stores or releases carbon by changing which microbes thrive there, potentially creating a feedback loop that worsens climate warming. This matters because soil health affects the food we grow and the air we breathe, but the good news is that smarter land management (like reducing plastic waste and pollution) could help break this cycle before it spirals further.
Microplastics (MPs) affect biogeochemical cycles, but the mechanisms remain unclear due to uncertainties in soil properties and microbial interactions. This paper reviews the latest advances in how increasing MPs pollution alters soil carbon pool stability and microbial community phylogeny, thereby regulating the carbon cycle. In addition to the direct microbial utilization of MPs derivatives, changes in the oxygen environment and electron transport facilitate the mineralization of primary organic matter in soil. Complex agglomerates of MPs, minerals, and organic matter help mitigate this priming effect. Moreover, the plastisphere ecology enriches carbon-turnover microorganisms and regulates functional gene expression involved in carbon cycling, possibly inducing microbial adaptive evolution through different mechanisms. This leads to ecological niche reconstruction and further regulation of carbon turnover interactions within communities. Climate warming and MPs pollution form a positive feedback loop, posing substantial ecological risks. Meta-analysis indicates that targeted land-use management can effectively mitigate these risks by reducing MPs pollution. Future research should focus on MPs ecological risk classification, carbon turnover response thresholds, microbial interactions, the ecological risks of degradable plastics, and in situ monitoring techniques to promote sustainable soil management and support global carbon neutrality goals. Diagram showing the connections between bioavailable chemicals, plastic particles, carbon sources and sinks, and diverse microbial taxa affecting climate warming.The diagram illustrates the interactions of environmental components. At the top, "Bioavailable chemicals" is shown with molecular structures. On the left, "Plastic particles" include images of items like bags and bottles, linked to "Carbon source" and "Carbon sink". The center features "Carbon turnover function taxa," including diverse microorganisms surrounding DNA, indicating their roles in carbon cycling. Below is "Complex aggregates," representing smaller components. On the right, arrows connect "Land use strategy," "Plastic pollution," and "Climate warming," emphasizing their interrelated impacts.
More Papers Like This
The plastic-carbon-climate nexus: Carbon sequestration, microbial adaptation, and land use solutions for a warming microplastics-contaminated world
AI summary Read the abstract
This review pulls together research showing that tiny plastic particles in soil don't just pollute the land, they mess with the microbes and carbon storage that help keep our climate stable, potentially triggering a worsening cycle where plastic pollution and global warming feed off each other. The encouraging news: smarter land management (like reducing plastic waste in farming) can help break this cycle, offering a practical path forward as scientists work to better understand the risks these plastics pose to soil health and, ultimately, the food systems we depend on.
The plastic-carbon-climate nexus: Carbon sequestration, microbial adaptation, and land use solutions for a warming microplastics-contaminated world
AI summary Read the abstract
This review paper pulls together current research on how microplastic pollution in soil disrupts the natural process by which soil stores carbon, partly by changing the mix of microbes living there and how they break down organic matter. This matters because soil is one of the planet's biggest carbon storage systems, if microplastics weaken its ability to hold carbon, that could accelerate climate warming, which in turn may worsen microplastic buildup in a troubling feedback loop. The good news: the authors point to smarter land management as a practical way to cut microplastic pollution and help protect this critical carbon-storing function.
Role of soil microplastic pollution in climate change
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This review examined the bidirectional relationship between soil microplastic pollution and climate change, exploring how microplastics affect soil carbon cycling, greenhouse gas emissions, and how climate factors influence microplastic behavior in soils.
[Effects of Microplastics and their Properties on Soil Organic Carbon Fractions: A Meta-analysis].
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Scientists analyzed nearly 850 soil samples from studies worldwide and found that microplastics in soil actually boost the amount of carbon stored there, particularly in a stable, long-lasting form. While this sounds like good news for fighting climate change, it's a double-edged sword: the same plastic pollution building up in our soil also raises concerns about contamination of the food we grow and the water we drink, since microplastics don't just disappear—they accumulate in the environment we depend on for our health.
Ecological effect of microplastics on soil microbe-driven carbon circulation and greenhouse gas emission: A review
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This review examines how microplastics in soil affect carbon cycling by altering microbial activity, with implications for greenhouse gas emissions and climate change. Researchers found that microplastics can change soil structure, nutrient availability, and microbial community composition in ways that affect how carbon is stored or released from soil. The study suggests that widespread microplastic contamination in agricultural and natural soils could have far-reaching consequences for the global carbon balance.
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