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COVER Heavy pollution blankets Tiananmen Square, Beijing, on 27 December 2007. Chinese authorities are taking drastic measures to improve the city's air quality for the Olympics. Bad air is just one of many environmental challenges China is facing. See the special News Focus section beginning on page 628. Image: Feng Li/Getty Images

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Science. ISSN 0036-8075 (print), 1095-9203 (online)