Photos: Cities dim for 'Earth Hour'
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Credit: AFP/Getty Images
A combo picture made on March 31, 2012 shows Madrid's famous Almudena cathedral litten (top) and with the lights turned off during the Earth Hour. 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)
