Photos: Cities dim for 'Earth Hour'
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Credit: AFP/Getty Images
People gather in front of the ION Orchard shopping mall (C) before its lights are darkened to mark the sixth annual Earth Hour on March 31, 2012 in Singapore. 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. Since it began in Sydney in 2007, Earth Hour has grown to become what environmental group WWF says is the world's largest demonstration of support for action on carbon pollution. AFP PHOTO/ROSLAN RAHMAN (Photo credit should read ROSLAN RAHMAN/AFP/Getty Images)
