In this report, the WBGU explains the reasons for the desperate need for a post-fossil economic strategy, yet it also concludes that the transition to sustainability is achievable, and presents ten concrete packages of measures to accelerate the imperative restructuring. The new WBGU-Study, `A Social Contract for Sustainability' appears at a time in which people around the world are increasingly committed to creating a future that is both sustainable and climate-safe. The study shows that such a future will only be possible if governments, business and civil society collectively set the right course, making the most of regional, national and global cooperation.