© AP Photo/Alexander F. Yuan, File FILE - In this Feb. 26, 2014 file photo, children walk back home after school on a severely polluted day in Shijiazhuang, in northern China's Hebei province. A groundbreaking…http://www.msn.com/en-us/news/other/us-to-pledge-dollar3b-to-help-poor-nations-with-warming/ar-BBdKfaM
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