Aerial photo taken on Aug. 15, 2020 shows a glacier, located at the source area of the Yangtze River, in Yushu Tibetan Autonomous Prefecture of northwest China's Qinghai Province. (Xinhua/Wu Gang)

Aerial photo taken on Aug. 15, 2020 shows a glacier, located at the source area of the Yangtze River, in Yushu Tibetan Autonomous Prefecture of northwest China's Qinghai Province. (Xinhua/Wu Gang)

Aerial photo taken on Aug. 15, 2020 shows a glacier, located at the source area of the Yangtze River, in Yushu Tibetan Autonomous Prefecture of northwest China's Qinghai Province. (Xinhua/Wu Gang)

Aerial photo taken on Aug. 15, 2020 shows a glacier, located at the source area of the Yangtze River, in Yushu Tibetan Autonomous Prefecture of northwest China's Qinghai Province. (Xinhua/Wu Gang)

Aerial photo taken on Aug. 15, 2020 shows a glacier, located at the source area of the Yangtze River, in Yushu Tibetan Autonomous Prefecture of northwest China's Qinghai Province. (Xinhua/Wu Gang)

Aerial photo taken on Aug. 15, 2020 shows a glacier, located at the source area of the Yangtze River, in Yushu Tibetan Autonomous Prefecture of northwest China's Qinghai Province. (Xinhua/Wu Gang)

Aerial photo taken on Aug. 15, 2020 shows the Ga'erqu River, a river formed from the melt water of a glacier, located at the source area of the Yangtze River, in Yushu Tibetan Autonomous Prefecture of northwest China's Qinghai Province. (Xinhua/Wu Gang)

Aerial photo taken on Aug. 15, 2020 shows a glacier, located at the source area of the Yangtze River, in Yushu Tibetan Autonomous Prefecture of northwest China's Qinghai Province. (Xinhua/Wu Gang)

Aerial photo taken on Aug. 15, 2020 shows a glacier, located at the source area of the Yangtze River, in Yushu Tibetan Autonomous Prefecture of northwest China's Qinghai Province. (Xinhua/Wu Gang)