Photos: Cities dim for 'Earth Hour'
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Credit: AFP/Getty Images
A picture taken on March 31, 2012 shows the Vilnius Cathedral illuminated before the lights being switched off to mark the annual Earth Hour in Vilnius. 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 / PETRAS MALUKAS (Photo credit should read PETRAS MALUKAS/AFP/Getty Images)
