A new analysis emphasizes the large variability in greenhouse gas emissions from alternative fuels. Researchers at MIT say the industry may want to cool its jets and make sure it has examined biofuels’ complete carbon footprint before making an all-out push. They say that when a biofuel’s origins are factored in — for example, taking into account whether the fuel is made from palm oil grown in a clear-cut rainforest — conventional fossil fuels may sometimes be the “greener” choice.
“What we found was that technologies that look very promising could also result in high emissions, if done improperly,” says James Hileman, principal research engineer in the Department of Aeronautics and Astronautics, who has published the results of a study conducted with MIT graduate students Russell Stratton and Hsin Min Wong in the online version of the journal Environmental Science and Technology. “You can’t simply say a biofuel is good or bad — it depends on how it’s produced and processed, and that’s part of the debate that hasn’t been brought forward.”
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