Carbon credit markets can be an effective approach to mitigating carbon use, incentivizing alternative energy adoption, and storing carbon emissions. However, they face obstacles including confusion about the potential for carbon storage and tepid confidence regarding the integrity of carbon credits. This project will develop a definition and requirements and consensus among leading NGOs for high-integrity carbon credits supporting tropical forest protection. It will then pursue research on emerging nature-based solutions including temperate forests, soils and oceans to build a pipeline of high-integrity credit opportunities.