Microplastics in Soil a ‘Trojan Horse’ for Toxins

Nature & Climate Perspective

**Microplastic-driven pollutant accumulation directly undermines subterranean microbial biodiversity, jeopardizing the permanence and capacity of soil organic carbon sequestration within LULUCF projects. **

• Vectoring of agrochemicals and pathogens via microplastics suppresses beneficial mycorrhizal fungi, impairing the natural biophysical mechanisms required for stable soil organic matter formation.
• The compound toxicity of adsorbed persistent organic pollutants degrades soil structure and microbial respiration, threatening the durability of biological carbon sequestration in regenerative agriculture frameworks.
• Systemic ecological degradation across the soil matrix weakens baseline ecosystem resilience, increasing vulnerability to erosion and accelerating the reversal of stored carbon under extreme weather stress.

Market & Policy Outlook

**Evidence of microplastic soil vectoring elevates screening requirements under ICVCM Core Carbon Principles, impacting valuation and Scope 3 compliance for agricultural land assets. **

• Standards bodies operating under Article 6.4 and voluntary registries are likely to mandate toxicological and plastic contaminant audits to satisfy ICVCM CCP 9 (Sustainable Development and Safeguards) 'do no harm' criteria.
• Soil carbon removal credits risk structural price discounts or stranded-asset status as buyers discount nature-based issuances lacking rigorous screening for chemical-laden microplastic residues.
• Corporate buyers targeting SBTi Forest, Land, and Agriculture (FLAG) goals face heightened Scope 3 supply chain scrutiny, requiring upstream agronomic monitoring to prevent reputational and regulatory compliance failures.