FILE - In this Sept. 13, 2014, file photo, California Gov. Jerry Brown, front right, and China's National Development and Reform Commission Vice Chairman Xie Zhenhua, front left, sign an agreement to boost bilateral cooperation on climate change during a news conference at the Bay Area Council, in San Francisco. As tensions between China and the United States ratchet up, former California Gov. Jerry Brown sees a way to bring together the world's largest carbon emitter and a U.S. state that's leading the way in energy standards: climate change. (AP Photo/Beck Diefenbach,file)
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