Workers walk past the Sun Valley of the Expo Axis equipped with LED lights in the 2010 World Expo Site in east China's Shanghai Municipality, Feb. 3, 2010. More than 80% of Shanghai World Expo Site is lit with energy-saving LED lights to highlight the China's largest model district of solar cells application. About 60% to 70% of the carbon dioxide emission is to be set off as electric, super capacitor and hydrogen vehicles are put into use as well during the expo, according to experts. (Xinhua/Niu Yixin)