As others have said, ethanol as a way to move to renewable energy and reduce dependence on fossil fuels is an expensive sham that is motivated by the farm looby. The problem with using corn to produce ethanol is that it consumes more energy than it produces (and subsidized to the tune of about $3 Billion annually in the US). Here is one reference:
David Pimentel, a professor of ecology at Cornell University, who has been studying grain alcohol for 20 years, and Tad Patzek, an engineering professor at the University of California, Berkeley, co-wrote a recent report that estimates thatr making ethanol from corn requires 29 percent more fossil energy than the ethanol actually contains.
The two scientists calculated all the fuel inputs for ethanol production - from the diesel fuel for the tractor planting the corn, to the fertilizer put in the field, to the energy needed at the processing plant - and found that ethanol is a net energy loser. According to their calculations, ethanol contains about 76,000 BTU’s per gallon, but producing that ethanol from corn takes about 98,000 BTU’s. For comparison, a gallon of gasoline contains about 116,000 BTU’s per gallon. But making that gallon of gas - from drilling the well, to transportation, through refining - requires around 22,000 BTU’s.