Efforts taken to restore ecological environment in upper reaches of Yangtze River in Yunnan

File photo taken on March 24, 2017 shows the scenery in Shangri-la City of Tibetan Autonomous Prefecture of Deqen, southwest China's Yunnan Province. To keep Yangtze River clean and beautiful, efforts to restore ecological environment have been taken in the upper reaches of Yangtze River in Yunnan Province in recent years. (Xinhua/Lin Yiguang)