The radiative impact of microplastic and nanoplastic particles in the atmosphere is not well understood. Here the authors quantify their radiative forcing, finding that they can exceed that of black carbon regionally.
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Nature
Atmospheric warming contributions from airborne microplastics and nanoplastics | Nature Climate Change
Abatify Summary
Nature & Climate Perspective
**Airborne microplastics act as a direct radiative forcing agent that complicates the climate stability of sensitive biomes, potentially undermining the net-cooling efficacy of LULUCF projects. **
- Microplastics and nanoplastics (MNPs) in the atmosphere alter cloud seeding and precipitation patterns, threatening the hydrological stability of biodiversity hotspots.
- The deposition of dark-colored polymers on cryospheric surfaces reduces Earth's albedo, accelerating the loss of permanent ice and the subsequent release of sequestered methane.
- Long-term accumulation of non-biodegradable particles in soil and water cycles disrupts the biological carbon pump, potentially lowering the long-term sequestration capacity of natural sinks.
Market & Policy Outlook
**The discovery of plastic-driven atmospheric warming poses a direct challenge to ICVCM Core Carbon Principles, specifically regarding 'Robust Quantification' and 'No Net Harm' in carbon accounting. **
- Existing Article 6.2 and 6.4 frameworks do not currently account for non-GHG radiative forcing agents, which may lead to an overestimation of the warming mitigation provided by traditional carbon credits.
- Market liquidity for Nature-Based Solutions (NBS) may be impacted as MRV protocols evolve to require the monitoring of synthetic pollutants that could offset sequestration gains.
- Corporate adherence to SBTi and Scope 3 reporting may soon require disclosure of plastic lifecycle emissions to account for the 'hidden' warming impact of airborne synthetic waste.
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