Technology, Energy and Food |
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7.4 calories of energy is used for 1 calorie of food consumed (31 joules for every 4.2 joules)
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Technology, Energy and Food |
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7.4 calories of energy is used for 1 calorie of food consumed (31 joules for every 4.2 joules)
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Approximately 7.3 calories are used by the U.S. food system to deliver each calorie of food energy. Farming accounts for less than 20% of this expenditure, but still consumes more energy than it delivers.
Link: www.postcarbon.org/food
Source: Heinberg and Bomford (2009) The food and farming transition: Toward a Post Carbon Food System
Adapted from: M.C. Heller and G.A. Keoleian, “Life Cycle-Based Sustainability Indicators for Assessment of the U.S. Food System,” University of Michigan (2000)
