From climate activist Greta Thunberg, comes the essential handbook for making it happen. You might think it's an impossible task: secure a safe future for life on Earth, at a scale and speed never seen, against all the odds. Throughout, illuminating and often shocking grayscale charts, graphs, diagrams, photographs, and illustrations underscore their research and their arguments. This is one of our biggest challenges, she shows, but also our greatest source of hope. But it has to be us, and it has to be now.