Photo taken on Jan. 1, 2020 shows the scenery of Lhalu wetland in Lhasa, southwest China's Tibet Autonomous Region. Lhalu Wetland National Nature Reserve is known as "the Lung of Lhasa". Photo:Xinhua

Bar-headed geese are seen at Lhalu wetland in Lhasa, southwest China's Tibet Autonomous Region, Jan. 1, 2020. Lhalu Wetland National Nature Reserve is known as "the Lung of Lhasa". Photo:Xinhua

Photo taken on Jan. 1, 2020 shows the scenery of Lhalu wetland in Lhasa, southwest China's Tibet Autonomous Region. Lhalu Wetland National Nature Reserve is known as "the Lung of Lhasa". Photo:Xinhua

Bar-headed geese fly over Lhalu wetland in Lhasa, southwest China's Tibet Autonomous Region, Jan. 1, 2020. Lhalu Wetland National Nature Reserve is known as "the Lung of Lhasa". Photo:Xinhua