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<p>Stabilizing the worlds climates means cutting carbon dioxide pollution. Theres no way around it. But what if thats not enough? What if its too difficult to accomplish in the time allotted or, worse, what if its so late in the game that even cutting carbon emissions to zero, tomorrow, wouldnt do?</p><p>Enter solar geoengineering. The principle is simple: attempt to cool Earth by reflecting more sunlight back into space. The primary mechanism, shooting particles into the upper atmosphere, implies more pollution, not less. If that doesnt sound scary, it should. There are lots of risks, unknowns, and unknowables.</p><p>In<i>Geoengineering: The Gamble</i>, climate economist Gernot Wagner provides a balanced take on the possible benefits and all-too-real risks, especially the so-called moral hazard that researching or even just discussing (solar) geoengineering would undermine the push to cut carbon emissions in the first place. Despite those risks, he argues, solar geoengineering may only be a matter of time. Not<i>if</i>, but<i>when</i>.</p><p>As the founding executive director of Harvards Solar Geoengineering Research Program, Wagner explores scenarios of a geoengineered future, offering an inside-view of the research already under way and the actions the world must take to guide it in a productive direction.</p>