Photos: Cities dim for 'Earth Hour'
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Credit: Getty Images
SYDNEY, AUSTRALIA - MARCH 31: (EDITORS NOTE: Image is a digital composite) In this composite image the Sydney city skyline is seen before on March 30, 2012 (top) and after the lights are switched off for Earth Hour on March 31, 2012 in Sydney, Australia. Earth Hour encourages individuals around the world to turn off their lights for one hour at 20:30 local time on March 31, 2012 to take a stand against climate change. (Photo by Lisa Maree Williams/Getty Images)
