Building Global Infrastructure is the fourth in a series of volumes-Patterns of Potential Human Progress-that uses the International Futures (IFs) simulation model to explore prospects for human development: how development appears to be unfolding globally and locally, how we would like it to evolve, and how better to assure that we move it in desired directions. Earlier volumes addressed the reduction of global poverty, the advance of global education, and the improvement of global health. Volume 4 sets out to tell the story of the future of global infrastructure. The approach used in this book focuses on the question of whether individual societies will be able to meet future infrastructure demands. Related questions include the following: What is the range of realistically conceivable futures for infrastructure, considering both demand and supply? How are the demands for infrastructure balanced with the ability to meet these demands, thereby linking the physical and financial treatment of infrastructure? What are the effects of providing for infrastructure on issues such as economic productivity and health?