Photos: Cities dim for 'Earth Hour'
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Credit: AFP/Getty Images
The Vienna's city hall at Rathaus square is pictured with the lights off during the Earth Hour in Vienna on March 31, 2012. Hundreds of landmark buildings and millions of ordinary homes were switching off their lights Saturday as the annual "Earth Hour" moved around the globe in what was dubbed the world's largest voluntary action for the environment. AFP PHOTO/SAMUEL KUBANI (Photo credit should read SAMUEL KUBANI/AFP/Getty Images)
