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This combo of pictures shows the National Stadium, known as the Bird's Nest with the lights on (top) and with the lights off (bottom) during the annual Earth Hour event in Beijing on March 23, 2013. Millions of people were expected to switch off their lights for Earth Hour on March 23 in a global effort to raise awareness about climate change that was even to be monitored from space. AFP PHOTO /WANG ZHAO (Photo credit should read WANG ZHAO/AFP/Getty Images)
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