Corn Ethanol: Growing Food, Feed, Fiber ... and Fuel?

Corn ethanol is being used more and more as a fuel, but important debates over feed crops, food prices and the fuel efficiency of various biofuels may limit its future use.

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Ethanol can be made from feed crops such as corn, or cellulosic sources such as grasses, leftover corn stalks, and other woody materials with no food value. Today, most corn ethanol is produced in dry grind factories, which consume less energy than earlier generation wet mill plants. The corn is dried, milled, and then fermented and later distilled into ethanol.
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