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Representative Collin Peterson is furious that the Environmental Protection Agency is doing its job. The Minnesota Democrat says the agency is trying to kill off the biofuels industry — to the dismay of the corn farmers and ethanol producers he represents. He has vowed to vote against any bill, including climate change legislation, that might require the involvement of the E.P.A.

What inspired this tirade was an E.P.A. draft proposal showing how it intended to measure the greenhouse gas emissions from corn ethanol and other renewable fuels. The agency said it will not make any final rules until it completes further research, but its preliminary findings were not flattering to corn ethanol.

The E.P.A. was only doing what Congress ordered in the 2007 energy bill, which required a quadrupling of annual ethanol production to 36 billion gallons by 2022. In practical terms, this meant more traditional corn ethanol, until other more advanced forms of ethanol could make their way out of the labs. Scientists believe that various grasses and scrub trees that do not compete with food crops can someday be turned into fuel.

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