16 States Warn Big 4 Accounting Firms Over “Pushing Climate-Related Disclosures”

Nature & Climate Perspective

**Pushback against standardized climate disclosures threatens the verification infrastructure critical for nature-based carbon sequestration and LULUCF supply chain accounting. **

• Weakened corporate disclosure mandates reduce visibility into upstream deforestation, land degradation, and LULUCF footprint verification.
• The chilling effect on Big 4 carbon accounting services risks compromising data integrity for terrestrial and Blue Carbon sequestration claims.
• Inconsistent climate reporting frameworks undermine long-term ecological monitoring and biodiversity baseline benchmarking across corporate value chains.

Market & Policy Outlook

**Attorney General warnings to major audit firms introduce severe regulatory friction into corporate Scope 3 accounting and impede alignment with ICVCM Core Carbon Principles. **

• State-level legal threats create heightened compliance risks for auditors, complicating independent assurance required for Science Based Targets initiative (SBTi) validation.
• Disparate regulatory landscapes hinder market liquidity and pricing transparency for carbon assets, challenging the ICVCM CCP mandate for robust, standardized governance.
• Friction in domestic assurance mechanisms creates cross-border reporting divergence, impacting multinational integration with Article 6.2/6.4 ITMO accounting and I-REC validation.