Society today faces a difficult contradiction: we know exactly how the physical limits of our planet are being reached and exactly why we cannot go on as we have before ¿ and yet, collectively, we seem unable to reach crucial decisions for our future in a timely way. This book argues that our definition of prosperity, which we have long assimilated with the idea of material wealth, may be preventing us from imagining a future that meets essential human aspirations without straining our planet to the breaking point. In other words, redefining prosperity is a necessary and urgent task.