As scientists, politicians and concerned citizens scramble for solutions to the catastrophic effects of a warming world, is it time to be exploring the controversial topic of geoengineering? For decades, discerning readers have turned to journalist and historian Gwynne Dyer for his unparalleled acumen in serving up hard geopolitical truths. This book is built around Dyer's interviews with sixty climate scientists from around the globe, including the leading figures in the geoengineering field. One of the most interesting topics: the pros and cons of Solar Radiation Management, a possible planetary Hail Mary that is rife with political risks. But this book is about more than technological mega-projects. Dyer devotes ample space to the many innovative ideas on offer, but there is no get-out-of-jail-free card. We will need a whole portfolio of techniques and technologies-and a lot of hard, thankless work-to keep the planet hospitable for humanity.