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Ethanol may cause more smog, deaths?

Does use of ethanol fuel generate more smog and health problems than use of carbon-based fuels? Check out the new study by a Stanford University civil and environmental engineering professor, written up in an AP story today.
"It's not green in terms of air pollution," said study author Mark Jacobson, a Stanford University civil and environmental engineering professor. "If you want to use ethanol, fine, but don't do it based on health grounds. It's no better than gasoline, apparently slightly worse."