This book discusses climate change and responses to its risks-mitigation, adaptation, and geoengineering-within an increasingly ideological and geopolitically charged climate debate. It provides a detailed analysis of the scientific basis, feasibility, governance, costs, uncertainties, and risks associated with different forms of geoengineering, particularly Solar Radiation Modification (SRM). Although climate change is very unlikely to cause “civilizational collapse” or “global collapse,” insufficient climate action is expected to cause harmful impacts that could severely affect much of humanity. SRM would introduce additional uncertainties and risks. Effective mitigation and adaptation depend on moral responsibility and a strong commitment to intra- and intergenerational justice.