Global energy needs are expanding substantially as populations grow and economies develop around the world. There is clear evidence that continued use of fossil fuels as the world's dominant energy supply is damaging the environment and causing changes in global climate patterns. People want higher levels of more efficient, cleaner, and less obtrusive energy services. How much of those needs will be met by fossil fuels, how much by alternative fuels, and how much by efficiency increases and expanded energy conservation is a wide open question. Global Energy Perspectives describes the results of a five-year joint study by the International Institute for Applied systems Analysis and the World Energy Council. It presents six long-term energy futures which lay out the alternatives among future fuels, technologies, efficiency gains, conservation patterns, and pollution levels, and pinpoints the key choices that are most likely to characterize the twenty-first century. The primary audience will include researchers, educators, policy makers in private and public sectors and other workers in the energy, technology, economics and environmental areas, but the book will appeal to anyone interested in the future of energy production as a prerequisite for human development.