A girl promoting Earth Hour by lights the candles at the National Planetarium, Malaysia, Saturday, March 27, 2010. Homes, offices, towers and landmarks in cities around the world will turn off their lights from 8:30pm local time on March 27 for 60 minutes to raise awareness about climate change and the threat from rising greenhouse gas emissions

Guests promoting Earth Hour by lights the candles of Earth Hour '60' symbol at the National Planetarium, Malaysia, Saturday, March 27, 2010.Homes, offices, towers and landmarks in cities around the world will turn off their lights from 8:30pm local time on March 27 for 60 minutes to raise awareness about climate change and the threat from rising greenhouse gas emissions