Photos: Cities dim for 'Earth Hour'
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Credit: AFP/Getty Images
A picture taken on March 31, 2012 shows Castel Sant'Angelo with the lights switched off during the annual Earth Hour event in Rome. 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 / FILIPPO MONTEFORTE (Photo credit should read FILIPPO MONTEFORTE/AFP/Getty Images)
