This document discusses tropical rainforests and the benefits of protecting them. It notes that tropical rainforests contain the majority of the world's biodiversity but over half of all species have been lost since 1970. Protecting tropical rainforests can help address the two major environmental crises of extinctions and carbon emissions. Investing in projects that preserve tropical rainforests is one of the most impactful things that can be done globally to slow extinctions and reduce CO2 levels.