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A Cornell professor of ecology and a Berkeley environmental engineer recently did a careful calculation of how much energy it requires--in tractor time, fertilizer, processing, and transport--to make the "alternative" fuel ethanol from plantstuffs.
The answer: Creating one gallon of "green" ethanol from corn--which the U.S. government now subsidizes to the tune of $3 billion per year--takes 1.3 gallons of fossil fuel energy. It'd be more energy efficient to just not try. ...