Photo taken on June 29, 2014 shows the scenery of Serling Co (Serling Lake) in Nagqu Prefecture, southwest China's Tibet Autonomous Region. Locating at an altitude of 4,530 meters, Serling Co is the third largest saltwater lake in China and the second largest lake in Tibet Autonomous Region. Its area, however, has enlarged from 1,955.49 square kilometers in 2002 to 2,197.46 square kilometers by 2009, due to the climate change and human activities, according to a research by Tibet Plateau Atmospheric Environment Science Research Institute. [Photo/Xinhua]

Herdsmen are seen near Serling Co (Serling Lake) in Nagqu Prefecture, southwest China's Tibet Autonomous Region, June 29, 2014. Locating at an altitude of 4,530 meters, Serling Co is the third largest saltwater lake in China and the second largest lake in Tibet Autonomous Region. Its area, however, has enlarged from 1,955.49 square kilometers in 2002 to 2,197.46 square kilometers by 2009, due to the climate change and human activities, according to a research by Tibet Plateau Atmospheric Environment Science Research Institute. [Photo/Xinhua]

Photo taken on June 29, 2014 shows the scenery of Serling Co (Serling Lake) in Nagqu Prefecture, southwest China's Tibet Autonomous Region. Locating at an altitude of 4,530 meters, Serling Co is the third largest saltwater lake in China and the second largest lake in Tibet Autonomous Region. Its area, however, has enlarged from 1,955.49 square kilometers in 2002 to 2,197.46 square kilometers by 2009, due to the climate change and human activities, according to a research by Tibet Plateau Atmospheric Environment Science Research Institute. [Photo/Xinhua]

                                                                                                     Editor:Karen Lin