Define Global Warming, Washington: Leading Climate Advocates in DC

Sen. Sheldon Whitehouse of Rhode Island talks with Senate Environment and Public Works Chairwoman Sen. Barbara Boxer of California with New York Rep. Paul Tonko during a 'Wake Up Congress for Climate Action Rally' on Capitol Hill May 21, 2014 in Washington, DC. Global warming continues to be a hot-button political issue, particularly as the 2016 presidential election draws closer.

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