Eco-systems in upper reaches of Yangtze River protected in China's Sichuan

This aerial photo taken on August 18, 2017 shows forests in Wolong National Nature Reserve in southwest China's Sichuan Province. In recent years, authorities in Sichuan have carried out a series of ecological projects to protect eco-systems in the upper reaches of the Yangtze River. (Xinhua/Xue Yubin)