Photo taken on Jan. 8, 2013 shows a part of glacier in Purog Kangri, some 560 kilometers away from Nagqu Town in southwest China's Tibet Autonomous Region. The Purog Kangri glacier, whose ice field covers an area of 422 square kilometers, is considered to be the third largest in the world. (Xinhua/Chogo)

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Photo taken on Jan. 8, 2013 shows a part of glacier in Purog Kangri, some 560 kilometers away from Nagqu Town in southwest China's Tibet Autonomous Region. The Purog Kangri glacier, whose ice field covers an area of 422 square kilometers, is considered to be the third largest in the world. (Xinhua/Chogo)

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Photo taken on Jan. 8, 2013 shows a part of glacier in Purog Kangri, some 560 kilometers away from Nagqu Town in southwest China's Tibet Autonomous Region. The Purog Kangri glacier, whose ice field covers an area of 422 square kilometers, is considered to be the third largest in the world. (Xinhua/Chogo)

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Photo taken on Jan. 8, 2013 shows a part of glacier in Purog Kangri, some 560 kilometers away from Nagqu Town in southwest China's Tibet Autonomous Region. The Purog Kangri glacier, whose ice field covers an area of 422 square kilometers, is considered to be the third largest in the world. (Xinhua/Chogo)

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Photo taken on Jan. 8, 2013 shows a part of glacier in Purog Kangri, some 560 kilometers away from Nagqu Town in southwest China's Tibet Autonomous Region. The Purog Kangri glacier, whose ice field covers an area of 422 square kilometers, is considered to be the third largest in the world. (Xinhua/Chogo)

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Photo taken on Jan. 8, 2013 shows a part of glacier in Purog Kangri, some 560 kilometers away from Nagqu Town in southwest China's Tibet Autonomous Region. The Purog Kangri glacier, whose ice field covers an area of 422 square kilometers, is considered to be the third largest in the world. (Xinhua/Chogo)

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Photo taken on Jan. 8, 2013 shows a part of glacier in Purog Kangri, some 560 kilometers away from Nagqu Town in southwest China's Tibet Autonomous Region. The Purog Kangri glacier, whose ice field covers an area of 422 square kilometers, is considered to be the third largest in the world. (Xinhua/Chogo)