There won't be any significant breakthrough [in engine emissions] for at least three decades. There's no technical fix. All we can do is reduce the amount we fly." So says Joss Garman, founder of the anti-airline PlaneStupid.com environmentalist website. But talk to Mike Benzakein, Wright Brothers Institute professor and chair of the Aerospace Engineering Dept. at Ohio State University, or Alan Epstein, former R. C. MacLaurin professor of aeronautics and astronautics, Dept. of Aeronautics ...

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