OARDC, the research arm of our college based in northeast Ohio, is converting four of its vehicles to run on natural gas — but not just any natural gas. Gas produced locally from renewable, plentiful organic waste, such as chicken fat, rotten tomatoes, and the byproducts of making potato chips. Even better, the fuel costs only about two-thirds as much as gasoline and, when burned, emits about a third less greenhouse gas. Read more. (K.D. Chamberlain image.)