To solve the climate crisis, we need to make tropical forests worth more alive than dead, says environmental economist Nat Keohane. Highlighting the urgent need to stop deforestation and the carbon pollution it brings, he details the work of the LEAF Coalition -- a first-of-its-kind public-private partnership that's channeling one billion dollars into protecting tropical forests -- and shares three building blocks for a robust market for forest carbon that enables economies to thrive while protecting natural resources.