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In the past decade, planting trees has come to represent many things: a virtuous act, a practical solution and a symbol of hope in the face of climate change. But can planting a trillion trees really save the world?\n\nVisiting the Eden Reforestation Projects in Goi\xe1s, Brazil, and interviewing numerous international scientists and activists, the journalist Zach St. George offers a vivid insight into the root of the tree-planting movement \u2014 from the Green Belt Movement of the 1970s to the Trillion Tree Campaign of the 2010s \u2014 and considers the concept\u2019s environmental potential, as well as the movement\u2019s shortcomings.