Photos: Cities dim for 'Earth Hour'
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Credit: AFP/Getty Images
Participants illuminate a sign made with bottle caps and reading 'Kenya Earth Hour' with solar-powered LED lights in Nairobi during the annual Earth Hour campaign on March 31, 2012. Millions of people are expected to switch off their lights for Earth Hour Saturday in a global effort to raise awareness about climate change that will even be monitored from space. Earth Hour is being celebrated in a record 150 countries and territories and 6494 towns and cities to send the message that our combined efforts are needed to change our future to one that is sustainable. AFP PHOTO / TONY KARUMBA (Photo credit should read TONY KARUMBA/AFP/Getty Images)
