As scientists call for widespread climate action, there has been an alarming rise in climate doomism, the belief that it is too late to do anything about climate change. Many people who struggle to imagine the solutions and social order that would be needed to support more sustainable outcomes instead look away and do nothing, immobilized by defeatist thinking. Yet every fraction of a degree of warming avoided means saving lives and livelihoods in the future. Drawing from climate science, sociology, psychology, and philosophy, Rejecting Climate Doomism outlines the reasons to instead choose action grounded in active hope. It examines how global warming could be effectively limited through specific policy proposals. Despite the many obstacles to achieving some of the policies discussed in this book, they are still possible and worth pursuing. By outlining a positive vision of the far-reaching changes that can be used to minimize warming, the book encourages readers to advocate for the social and economic changes necessary to forge the best path for people and the planet.