The voluntary carbon market is experiencing explosive growth but lacks standards for high-quality carbon credits. WWF-US and EDF are working on a solution called the Carbon Credit Guidance for Buyers (CCG4B) project to provide clear, authoritative ratings and guidance for carbon credit buyers. Phase 1 defined criteria for assessing carbon credit quality through stakeholder consultation. Future phases will develop a robust methodology, apply ratings to project types, and publish a report endorsing guidance on responsible purchasing, navigating the market, and making mitigation claims. The CCG4B aims to help buyers, project developers, and policymakers determine and improve carbon credit quality.