Thomas Crowther has identified long-disappeared forests available for restoration across the world, finding that there is room for an additional 1.2 trillion new trees globally that could absorb more carbon than human emissions each year. Crowther also describes data from thousands of soil samples collected by local scientists that reveal the world’s Arctic and sub-Arctic regions store most of the world’s carbon. But the warming of these ecosystems is causing the release of this soil carbon, a process that could accelerate climate change by 17 percent. This research reveals that the restoration of vegetation and soil carbon is by far the best weapon in the fight against climate change.