Growing influence of Earth Hour

Celebrities push for environmental protection, seeking greater action on climate change. Yan Dongjie reports.

The Beijing National Stadium, or Bird's Nest, switched off its lights on the evening on March 24, the first of more than 3,100 buildings in over 200 cities around China in support of Earth Hour, a global event started by the World Wide Fund for Nature.

"It's not only about switching off the lights for one hour, it's about lighting up people's awareness of environmental protection and calling on people to shoulder their responsibilities," says Chinese film star Li Bingbing.