Bj?rn Lomborg invites leading economists to provide an innovative 150-year view of humanity's biggest challenges, measured in economic terms.A selection of the world's leading economists discuss ten of the greatest challenges that have blighted human development since 1900, quantifying their costs in percent of GDP through to 2050. Rather than offering definitive answers, this innovative book encourages debate and will engage a wide readership.A selection of the world's leading economists discuss ten of the greatest challenges that have blighted human development since 1900, quantifying their costs in percent of GDP through to 2050. Rather than offering definitive answers, this innovative book encourages debate and will engage a wide readership.There are often blanket claims that the world is facing more problems than ever but there is a lack of empirical data to show where things have deteriorated or in fact improved. In this book, some of the world's leading economists discuss ten problems that have blighted human development, ranging from malnutrition, education, and climate change, to trade barriers and armed conflicts. Costs of the problems are quantified in percent of GDP, giving readers a unique opportunity to understand the development of each problem over the past century and the likely development into the middle of this century, and to compare the size of the challenges. For example: how bad was air pollution in 1900? How has it deteriorated and what about the future? Did climate change cost more than malnutrition in 2010? This pioneering initiative to provide answers to many of these questions will undoubtedly spark debate amongst a wide readership.Introduction Bj?rn Lomborg; Executive summaries; 1. Air pollution Guy Hutton; 2. Armed conflicts S. Brock Blomberg and Gregory D. Hess; 3. Climate change Richard S. J. Tol; 4. Ecosystems and biodiversity Anil Markandya and Aline Chiabai; 5. Education Harry Anthony Patrinos and George Psacharopoulos; 6. Gender lc7