A scientific research member operates a drone to collect air sample at an atmosphere and environment observation and research station of the Mount Qomolangma region in southwest China's Tibet Autonomous Region, May 10, 2023. Chinese scientists have started a scientific expedition to the Mount Qomolangma region in southwest China's Tibet Autonomous Region, as part of the second comprehensive scientific expedition to the Qinghai-Tibet Plateau.

A total of 170 scientists are conducting research on water, ecology and human activities, aiming to reveal the mechanism of environmental change and optimize the ecological security barrier system on the plateau. (Xinhua/Jigme Dorje)