Workers walk past the Sun Valley of the Expo Axis equipped with LED lights in the 2010 World Expo Site in Shanghai, Feb 3, 2010. More than 80% of Shanghai World Expo Site is lit with energy-saving LED lights to highlight China's largest model district of solar cells application. Carbon dioxide emission is expected to drop by about 60% to 70% as electric, super capacitor and hydrogen vehicles are put into use as well during the expo, according to experts. [Xinhua]