Microplastics and nanoplastics are moving in the atmosphere worldwide. Now, research shows that they can interact with sunlight and influence the climate system.
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Nature
Small plastics with large warming potential | Nature Climate Change
Abatify Summary
Nature & Climate Perspective
**Microplastic pollution acts as a significant but often overlooked accelerator of global warming by degrading marine carbon sinks and emitting potent greenhouse gases through photodegradation. **
- Microplastics disrupt the biological pump by reducing the sinking rates of zooplankton fecal pellets, thereby hindering the vertical transport of organic carbon to the deep ocean.
- The breakdown of polymers like polyethylene and polypropylene under UV radiation releases methane and ethylene, contributing to atmospheric radiative forcing outside traditional LULUCF frameworks.
- Accumulated microplastics in the cryosphere lower surface albedo, accelerating the melting of sea ice and glaciers which destabilizes long-term carbon storage in permafrost regions.
Market & Policy Outlook
**The quantification of plastic-induced warming shifts corporate accountability from waste management to Scope 3 carbon liabilities and challenges the integrity of Blue Carbon credits under ICVCM standards. **
- Future regulatory shifts may require Article 6.2 and 6.4 mechanisms to incorporate 'plastic-interference' factors in Monitoring, Reporting, and Verification (MRV) protocols for marine-based mitigation.
- Under ICVCM Core Carbon Principles (CCPs), the 'Permanence' of Blue Carbon projects is threatened by plastic-driven ecosystem degradation, potentially leading to increased buffer pool requirements and lower market liquidity.
- SBTi and other corporate compliance frameworks are likely to expand Scope 3 boundaries to include the lifecycle GHG emissions of microplastic leakage, forcing a re-evaluation of Net Zero roadmaps.
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