Chinese demonstrators hold banners as they take part in a protest against a planned refinery project in downtown Kunming in southwest China's Yunnan province Thursday, May 16, 2013. About 2,000 demonstrators concerned about pollution have taken to the streets in southern China to protest plans for a planned refinery on the outskirts of the city of Kunming. The placards read: "No to Kunming PX, (paraxylene)." (AP Photo/Aritz Parra)

Associated Press
Chinese demonstrators hold banners  as they take part in a protest against a planned refinery project in downtown Kunming in southwest China's Yunnan province Thursday, May 16, 2013. About 2,000 demonstrators concerned about pollution have taken to the streets in southern China to protest plans for a planned refinery on the outskirts of the city of Kunming. The placards read: "No to Kunming PX, (paraxylene)." (AP Photo/Aritz Parra)
Chinese demonstrators hold banners as they take part in a protest against a planned refinery project in downtown Kunming in southwest China's Yunnan province Thursday, May 16, 2013. About 2,000 demonstrators concerned about pollution have taken to the streets in southern China to protest plans for a planned refinery on the outskirts of the city of Kunming. The placards read: "No to Kunming PX, (paraxylene)." (AP Photo/Aritz Parra)
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