Photos: Cities dim for 'Earth Hour'
Par6978918
Credit: AFP/Getty Images
This combo of pictures shows peole posing for pictures in front of leaning tower of Pisa and the Cathedral on the square of Miracles with the lights on (top) and with the lights off (bottom) during the Earth Hour, on March 31, 2012, in Pisa. Millions of people were expected to switch off their lights for Earth Hour on March 31 in a global effort to raise awareness about climate change that was even to be monitored from space. AFP PHOTO/FABIO MUZZI (Photo credit should read FABIO MUZZI/AFP/Getty Images)
