WASHINGTON (AP) — In a story April 20 about new research showing biofuels made with corn leftovers are worse for global warming than gasoline in the short term, The Associated Press erroneously reported that cellulosic biofuels that failed to release 60 percent less carbon than gasoline wouldn’t earn a $1 per gallon subsidy. That tax subsidy expired on Dec. 31, 2013.

A corrected version of the story is below:

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