Climate engineering - which could slow the pace of global warming by injecting reflective particles into the upper atmosphere - has emerged in recent years as an extremely controversial technology. A leading scientist long concerned about climate change, David Keith offers no naive proposal for an easy fix to what is perhaps the most challenging question of our time. But he argues that after decades during which very little progress has been made in reducing carbon emissions, we must put climate engineering on the table and consider it responsibly. This book provide a clear and accessible overview of its costs and risks and explains how climate engineering might fit into a larger program for managing climate change. -- From back cover of the book.