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Phyllis Cuttino, director of Pews Clean Energy Program, and Cindy Ortega, senior vice president and chief sustainability officer of MGM Resorts, pose in the Crystals retail mall, a LEED Gold certified building, during a tour of CityCenters sustainable features and cogeneration plant Monday, Aug. 12, 2013. Cuttino is town to attend the National Clean Energy Summit 6.0 which begins Tuesday, Aug. 13 at Mandalay Bay.

Steve Marcus