Visitors look around at the 2009 Hangzhou International Recycling Economy and Environmental Industry Expo of China in Hangzhou, east China's Zhejiang Province, October 31, 2009. Focusing on clean energy, energy conservation, emission reduction and new environmental technology, the expo, which was kicked off on Saturday, attracted more than 170 Chinese and overseas enterprises. [Xinhua]

New energy saving and environmental friendly building materials are demonstrated at the 2009 Hangzhou International Recycling Economy and Environmental Industry Expo of China in Hangzhou, east China's Zhejiang Province, October 31, 2009. [Xinhua]