U.S. corn-based ethanol worse for the climate than gasoline, study finds
Corn-based ethanol, which for years has been mixed in huge quantities into gasoline sold at U.S. pumps, is likely a much bigger contributor to global warming than straight gasoline, according to a study published Monday.
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### Instruction: U.S. corn-based ethanol worse for the climate than gasoline, study finds

### Response: Corn-based ethanol, which for years has been mixed in huge quantities into gasoline sold at U.S. pumps, is likely a much bigger contributor to global warming than straight gasoline, according to a study published Monday.