People have converted almost half of the world's native habitats to agriculture (excluding desert and ice) and harvested more than 75% of the remaining forests. This conversion has contributed more than a quarter of the greenhouse gases people have added to the atmosphere and has been the primary cause of biodiversity loss. In the next 30 years, the world is on a path to convert vast additional areas and harvest vastly more forests to meet rising demands for food, wood, and energy.