A Harvard study last year showed the use and production of ethanol emits up to 46% fewer greenhouse gasses than gasoline. A University of Wisconsin study has challenged that finding, saying ethanol is worse for the environment than gasoline, based on changes in how land is used to grow the corn used to produce it. But the Argonne National Laboratory disagreed with the Wisconsin study last month, saying the group overestimated carbon loss from soil and double-counted some emissions, among other concerns.
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