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Energy’s Great Green Hope
As crops supplant oil as an energy source, the economics of agriculture are being rewritten
By John Carey

Ever since our ancestors in the Fertile Crescent first figured out how to grow grains, crops have been used mainly to feed people and livestock. But now that’s changing in response to the high price of oil, the cost in lives and dollars of ensuring a supply of petroleum imports, and coming limits on climate-warming emissions of fossil fuels. Farms are energy’s great green hope.