Technology, Energy and Food

Technology, Energy and Food

7.4 calories of energy is used for 1 calorie of food consumed

(31 joules for every 4.2 joules)



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.




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)