Photos: Cities dim for 'Earth Hour'
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Credit: AFP/Getty Images
Street artists perform during the annual Earth Hour in Rome on March 31, 2012. Millions of people were expected to switch off their lights for Earth Hour on March 31 in a global effort to raise awareness about climate change that was even to be monitored from space. AFP PHOTO / FILIPPO MONTEFORTE (Photo credit should read FILIPPO MONTEFORTE/AFP/Getty Images)
