"Corn is an OK source for ethanol," said Daniel Kammen, a professor at the University of California at Berkeley and director of its Institute of the Environment. "But if you really want to hit a home run, you need to go to cellulose."
"When you make ethanol from corn, for every gallon of fuel you get, you put in about seven-tenths of a gallon of fossil energy, oil or natural gas," he said. "That's only a small improvement in terms of greenhouse gases."
On the other hand, he said, "ethanol from cellulose [like switchgrass] is a great energy strategy because for every gallon of ethanol, a tiny amount of fossil material [is used.] There's a dramatic reduction in greenhouse gases, so from an energy perspective it's far superior."
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