China's first "Scientific Assessment of the Environmental Impact of Human Activities on the Qinghai-Tibet Plateau" was officially released on May 5. The assessment found that human activity on the Tibetan Plateau dates back 20,40 years. In the past 20 years, the plateau tourist population has increased by 2 times, and the pressure on the ecological environment has increased. China has always attached great importance to the protection of the plateau's ecological environment, including the establishment of China's first national park, Sanjiangyuan National Park.