Photos: City skylines across the globe
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Credit: Getty Images
The Sydney Skyline is seen before the lights are switched off for Earth Hour on March 26, 2011 in Sydney, Australia. (Photo by Lisa Maree Williams/Getty Images)
Credit: Getty Images
The Sydney Skyline is seen before the lights are switched off for Earth Hour on March 26, 2011 in Sydney, Australia. (Photo by Lisa Maree Williams/Getty Images)
