| http://www.w3.org/ns/prov#value | - posted 4 December 2011 at 5:30 PM by Geoff Russell If the EROEI of food production is around 0.1 according to some authors (Patzek, Pimental et al) then to make 9 MJ of food requires 90 MJ of energy input plus key materials notably water, carbon, nitrogen, sulphur, calcium and phosphorus.
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