Photo taken on May 4, 2010 shows the eco-wall of the theme pavilion in Shanghai Expo Park. The colour of green is prevailing inside the World Expo Park, which embodies the idea of low-carbon expo, and makes the park environment enjoyable. [Xinhua]

Photo taken on April 22, 2010 shows Houtan area, a wetland in Shanghai Expo Park. The colour of green is prevailing inside the World Expo Park, which embodies the idea of low-carbon expo, and makes the park environment enjoyable. [Xinhua]