Li Bingbing (1st L), an ambassador of Earth Hour campaign in China, introduces some energy-saving and environment-protective knacks during an activity held by the World Wide Fund for Nature (WWF) to welcome the UN climate change conference in Copenhagen, in Beijing, capital of China, December 2, 2009. [Xinhua]

Li Bingbing (C, front), an ambassador of Earth Hour campaign in China, poses for a photo with volunteers dress in the polar bear costumes during an activity held by the World Wide Fund for Nature (WWF) to welcome the UN climate change conference in Copenhagen, in Beijing, capital of China, December 2, 2009. [Xinhua]