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. Global Energy Perspectives presents six long-term energy futures that 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.