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Are biofuels truly “green?” Gizmag this morning has an entry on Empa, the Swiss Federal Laboratories for Materials Science and Technology, which has just released a report showing that biofuels may not always be as green as we would like to think. Further, they note that gasoline, including that coming from shale oil sands (as in Keystone XL pipeline oil) may be cleaner than certain crop-derived combustibles. The headlines may stoke controversy, so it’s worthwhile to examine the short-form charts and press release, and compare the impressions gained from a quick glance with those from reading the 113-page study itself. Empa’s press release headline and lead give the impression that things are grim in the green world. The headline “Most …