People gather in front of Malaysia's iconic Patronas Twin Towers (C) as they stand unlit during Earth Hour in Kuala Lumpur on March 31, 2012. 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. Since it began in Sydney in 2007, Earth Hour has grown to become what environmental group WWF says is the world's largest demonstration of support for action on carbon pollution. AFP PHOTO/Saeed KHAN
The Petronas Twin Towers in Kuala Lumpur, a Malaysian landmark, are pictured after lights were turned off for Earth Hour March 31, 2012. Landmarks in thousands of cities, from Sydney Harbour Bridge to the world's tallest building, the Burj Khalifa in Dubai, will turn off the power for Earth Hour, the sixth such event promoting a sustainable future for the planet. REUTERS/Bazuki Muhammad (MALAYSIA - Tags: CITYSPACE ENVIRONMENT ENERGY)
Tokyo's landmark the Tokyo Tower is seen after its lights were turned off for the 6th annual Earth Hour global warming campaign in central Tokyo on March 31, 2012. 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 / Yoshikazu TSUNO