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PREFACE
The history of human culture can be viewed as the progressive development of new energy sources and their associated conversion technologies. Advances in our understanding of energy have produced unparalleled transformations of society, as exemplified by James Watt’s steam engine and the discovery of oil. These transformations increased the ability of humans to exploit both additional energy and other resources, and hence to increase the comfort, longevity, and affluence of humans, as well as their numbers. Energy is related to human development in three important ways: as a motor of economic growth, as a principal source of environmental stress, and as a prerequisite for meeting basic human needs. Significant changes in each of these aspects of human existence are associated with changes in energy sources, beginning with the discovery of fire, the advent of agriculture and animal husbandry, and, ultimately, the development of hydrocarbon and nuclear fuels. The eventual economic depletion of fossil fuels will drive another major energy transition; geopolitical forces and environmental imperatives such as climate change may drive this transition faster than hydrocarbon depletion would have by itself. There is a diverse palette of alternatives to meet our energy needs, including a new generation of nuclear power, unconventional sources of hydrocarbons, myriad solar technologies, hydrogen, and more efficient energy end use. Each alternative has a different combination of economic, political, technological, social, and environmental attributes. Energy is the common link between the living and non-living realms of the universe, and thus provides an organizing intellectual theme for diverse disciplines. Formalization of the concept of energy and identification of the laws governing its use by 19th century physical scientists such as Mayer and Carnot are cornerstones of modern science an