| http://www.w3.org/ns/prov#value | - consistent framework, Ambio 37: 74-79. [5] Lee & DeVore (1968) Man the Hunter, Sahlins (1972) Stone Age Economics. [6] Canning et al. (2010) Energy Use in the U.S. Food System, report by USDA. [7] Pimentel & Pimentel (2008) Food, Energy and Society. [8] Electricity from coal, a fossil fuel, nuclear power and other sources is also important, but their contribution is small compared to oil and natur
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