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Published online by Cambridge University Press: 28 April 2015
Energy use in U.S. production of food and fiber is extensive and has increased rapidly. A threefold increase occurred from 1940 to 1970 (Carter and Yonde). Food and fiber production accounted for about 13 percent of the total energy consumed in the U.S. in 1980 (Duncan and Webb). Of the total energy use in food and fiber production, farm level production directly consumes about 21 percent (U.S. Senate Committee on Agriculture and Forestry).