This is a groundbreaking, essential book for our times. Thomas Homer-Dixon brings to bear his formidable understanding of the urgent problems that confront our world to clarify their scope and deep causes. The Upside of Down provides a vivid picture of the immense stresses that are simultaneously converging on our societies and threatening a breakdown that would profoundly shake civilization. It shows, too, how we can choose a better route into the future.

With the immediacy that characterized his award-winning international bestseller, The Ingenuity Gap, Homer-Dixon takes us on a remarkable journey – from the fall of the Roman empire to the devastation of the 9/11 attacks in New York, from Toronto in the 2003 blackout to the ancient temples of Lebanon and the wildfires of California. Incorporating the newest findings from an astonishing array of disciplines, he argues that the great stresses our world is experiencing – global warming, energy scarcity, population imbalances, and widening gaps between rich and poor – can’t be looked at independently. As these stresses combine and converge, the risk of breakdown rises. The first signs are appearing in the wastelands of the Arctic, the mud-clogged streets of Gonaïves, Haiti, and the volatile regions of the Middle East and Asia. But while the consequences of denial in our more perilous world are dire, Homer-Dixon makes clear that we can use ouremerging understanding of the complex systems in which we live to avoid catastrophic collapse in a way the Roman empire could not.