Photos: Cities dim for 'Earth Hour'
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Credit: AFP/Getty Images
View of Madrid's famous Real Palace with the lights turned off during thz Earth Hour on March 31, 2012. More than 120 countries participate in turning off lights for 60 minutes from 8:30 to 9:30 in the evening local time in an effort to raise global awareness on climate change. AFP PHOTO / DOMINIQUE FAGET (Photo credit should read DOMINIQUE FAGET/AFP/Getty Images)
