Photo taken on Jan. 15, 2021 shows the scenery of Purog Kangri Glacier, the third largest glacier in the world, in Shuanghu County, Nagqu, southwest China's Tibet Autonomous Region. (Xinhua/Zhang Rufeng)

Photo taken on Jan. 15, 2021 shows the scenery of Purog Kangri Glacier, the third largest glacier in the world, in Shuanghu County, Nagqu, southwest China's Tibet Autonomous Region. (Xinhua/Zhang Rufeng)

Photo taken on Jan. 15, 2021 shows the scenery of Purog Kangri Glacier, the third largest glacier in the world, in Shuanghu County, Nagqu, southwest China's Tibet Autonomous Region. (Xinhua/Zhang Rufeng)

Photo taken on Jan. 15, 2021 shows the scenery of Purog Kangri Glacier, the third largest glacier in the world, in Shuanghu County, Nagqu, southwest China's Tibet Autonomous Region. (Xinhua/Zhang Rufeng)

Photo taken on Jan. 15, 2021 with cellphone shows the ice surface of Purog Kangri Glacier, the third largest glacier in the world, in Shuanghu County, Nagqu, southwest China's Tibet Autonomous Region. (Xinhua/Shen Hongbing)

Photo taken on Jan. 15, 2021 with cellphone shows the icicles of Purog Kangri Glacier, the third largest glacier in the world, in Shuanghu County, Nagqu, southwest China's Tibet Autonomous Region. (Xinhua/Shen Hongbing)