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Population, environment, and energy are used as three significant determinants of agricultural systems. An Ecological History of Agriculture covers the span of time from the first known managed agriculture to an uncertain future. In a systematic manner, the author moves through chapters from the origins of agriculture to the future, covering topics along the span of time of the origins of agriculture, preindustrial agriculture, pastoralism, industrial agriculture, the present state of agriculture, and the future for agriculture. Interwoven is a global coverage of the influence of population, environment, and energy on agricultural systems as impacting ecosystems of the tropics, dry lands, dry summer lands, and humid temperate lands.