LAS VEGAS, NV - MARCH 26: A view of the Las Vegas Strip before Earth Hour from the House of Blues Foundation Room inside the Mandalay Bay Resort & Casino March 26, 2011 in Las Vegas, Nevada. ... more 
LAS VEGAS, NV - MARCH 26: A view of the Las Vegas Strip before Earth Hour from the House of Blues Foundation Room inside the Mandalay Bay Resort & Casino March 26, 2011 in Las Vegas, Nevada. Hotel-casinos in Las Vegas turned off marquees and non-essential exterior lighting to participate in Earth Hour, a global initiative by the World Wildlife Fund to focus attention on the threat of climate change. (Photo by Ethan Miller/Getty Images) less 
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Getty Images | Photo By Ethan Miller / Getty Images
Sun, Mar 27, 2011 6:04 AM EDT