This open access book describes in detail what life on this planet would be like if its average surface temperature were to rise 3 degrees Celsius above the preindustrial level. On this basis, the book argues that it is imperative to keep this temperature rise below 2 degrees Celsius. It then lays out a detailed plan of what politically feasible, cost-effective measures should now be taken to achieve this goal. In this context, the book provides detailed discussions of climate finance, climate education and nature-based solutions. The book has been translated into English from the original German version published in 2022, and contains an original foreword and preface.