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Phyllis Cuttino, director of Pews Clean Energy Program, puts her hand by an air condition vent under a slot machine on Aria's casino floor during a tour of CityCenters sustainable features and cogeneration plant Monday, Aug. 12, 2013. One of the advantages of lower vents is that the air doesn't need to be as cold compared to air that comes from overhead vents. Cuttino is town to attend the National Clean Energy Summit 6.0 which begins Tuesday, Aug. 13 at Mandalay Bay.

Steve Marcus