If words could wear out from use, one might suspect that for many of us words like green, sustainable, carbon, ozone, biodiesel, and ethanol would be pretty dogeared by now. But one that has retained plenty of zing is "ethanol," because it has given rise to lots of contention - environmental, economic, and political. Even as alternative fuel supporters are pushing the federal government to raise the ethanol content in blended gasoline from 10 percent to 15 percent, a report issued by a prestigious body of scientists questions ethanol's benefits, in particular corn ethanol.
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