Associated Press
In this Jan. 12, 2013 photo, a woman adjusts her mask while walking with her friend outside an amusement park on a polluted day in Beijing, China. Facing public outrage over smog-choked cities and filthy rivers, China's leaders are promising to clean up its neglected environment, a pledge that sets up a clash with political pressures to keep economic growth strong. (AP Photo/Alexander F. Yuan)

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