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This photo combo shows the landmark Seoul City Hall illuminated (top) and with lights turned off (bottom) during the 7th annual Earth Hour global warming campaign in Seoul on March 23, 2013. One minute brightly lit, the next plunged into darkness -- iconic landmarks around the world will cut their lights on March 23 for the "Earth Hour" campaign against climate change. AFP PHOTO / KIM JAE-HWAN (Photo credit should read KIM JAE-HWAN/AFP/Getty Images)
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