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SINGAPORE - MARCH 23: (EDITORS NOTE: Image is a digital composite.) The Singapore city skyline is seen before (top) and after the lights were switched off to recognize Earth Hour on March 23, 2013 in Singapore, Singapore. Businesses and households around the world switch their lights off for an hour at 20:30 local time on March 23, to celebrate Earth Hour and raise awareness about climate change and renewable energy. Earth hour began in Australia in 2007 and is now celebrated in over 150 countries around the world. (Photo by Suhaimi Abdullah/Getty Images)
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