Human activity is undeniably affecting the rates of change in many parts of the global system. How this global change develops into the future is vitally important, but modeling these changes requires a complex, integrated assessment of a wide range of disciplines in science and social science. This book describes the structure, assumptions, philosophy and results of an advanced global integrated assessment model: TARGETS. For a number of future directions selected on the basis of divergent cultural perspectives, the model charts global implications in terms of population and health, energy, land- and water-use and biogeochemical cycles. This integrated assessment approach has led to innovative fresh insights into global change. The book will help policymakers formulate the strategies required for a sustainable global future.