| http://www.w3.org/ns/prov#value | - Former coal miner Richard Trumka, who once headed the United Mine Workers and is the nation's top labor leader as president of the national AFL-CIO, told the United Nations Investor Summit on Climate Risk on Thursday that global warming is caused by burning coal and other human activity, and we have to act to cut those emissions, and act now. (Photograph of Trumka by Rainer Hosch, which accompai
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