Could carbon become the developing world’s new cash crop? Tropical forests store a quarter of the earth’s carbon and suck in 15% of all the CO2 we emit each year. REDD, aims to make tropical forests more valuable as living, breathing ecosystems than if they are cleared for farmland. Earth Report travels to the vast rainforests of Africas Congo Basin, to find out if forests can realistically pay their way as global carbon stores and who exactly will benefit.