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May 20, 2013

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U.S. Secretary of Energy Steven Chu speaks during a roundtable discussion at the National Clean Energy Summit 2.0 at UNLV Monday. Listening at left is U.S. Sen. Maria Cantwell (D-Wash.).

Steve Marcus

U.S. Secretary of Energy Steven Chu speaks during a roundtable discussion at the National Clean Energy Summit 2.0 at UNLV Monday. Listening at left is U.S. Sen. Maria Cantwell (D-Wash.).