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HONG KONG - MARCH 23: In this composite image, The Bank of China Tower, Cheung Kong Centre, HSBC building and Standard Charter Bank Building are seen before (top) and after the lights were switched off to recognize Earth Hour on on March 23, 2013 in Hong Kong, Hong Kong. Businesses and households around the world will turn their lights off for on hour at 20:30 local time today, to celebrate Earth Hour, raise awareness about climate change and to show support for the use of renewable energy. Earth hour began in Australia in 2007 and is now celebrated in over 150 countries around the world. (Photo by Jessica Hromas/Getty Images)
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