Photos: Cities dim for 'Earth Hour'
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Credit: AFP/Getty Images
A fire acrobat performs in front of the Bulgarian National Theatre, with lights turned off as part of the Earth Hour in Sofia 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 / DIMITAR DILKOFF (Photo credit should read DIMITAR DILKOFF/AFP/Getty Images)
