Singer Chang Csun Yuk performs during a concert to mark the "Earth Hour" in Dalian City, northeast China's Liaoning Province, March 31, 2012. The concert was powered by solar power cars. Main buildings and areas in many cities of China participated in the Earth Hour campaign on Saturday evening. "Earth Hour" is the world's largest environmental movement which encourages individuals, businesses and communities around the world to turn off their lights for one hour on the last Saturday of March in a bid to raise awareness on climate change. [Xinhua]