Climate Central reports: Years of number crunching that had seemed to corroborate the climate benefits of American biofuels were starkly challenged in a science journal on Thursday, with a team of scientists using a new approach to conclude that the climate would be better off without them.

Based largely on comparisons of tailpipe pollution and crop growth linked to biofuels, University of Michigan Energy Institute scientists estimated that powering an American vehicle with ethanol made from corn would have caused more carbon pollution than using gasoline during the eight years studied.

Most gasoline sold in the U.S. contains some ethanol, and the findings, published in Climatic Change, were controversial. They rejected years of work by other scientists who have relied on a more traditional approach to judging climate impacts from bioenergy — an approach called life-cycle analysis. [Continue reading…]