Photos: Cities dim for 'Earth Hour'
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Credit: AFP/Getty Images
This combo of pictures shows the Alexander Nevski cathedral with the lights on (L) and with the lights off (R), 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)
