"Unexpectedly, our place with an altitude of more than 4500 meters can grow trees now!" 30-year-old Lausanne said while dragging a rubber hose in the greenhouse to water the alpine willow seedlings with a height of more than 1 meter, "This tree species will not survive in less than two years if it is outside the greenhouse, and it will be transplanted to the outside in another year." Lausanne, a resident of Seni District, Naqu City, Tibet Autonomous Region, applied to work in the seedling breeding base of the Municipal Forestry and Grass Bureau last year. Most parts of the Qinghai-Tibet Plateau are more than 4000 meters above sea level, which is known as the "third pole of the earth". The brightest development background. Naqu City, with an area of more than 350000 square kilometers, has an average altitude of more than 4500 meters. The growth cycle of trees is only three months. Trees in most areas are difficult to survive. In recent years, Tibet, together with the Ministry of Science and Technology, has organized the implementation of the key technology research and development and greening model demonstration project for urban tree-planting in Naqu. The leading enterprises and a number of scientific research units have carried out research and successfully selected eight species, including Qinghai spruce, Qilian juniper, and alpine willow. More than 400000 trees have been planted and more than 300000 have survived. In the vast snowy plateau, a series of major ecological projects, such as afforestation and greening, restoration and treatment of degraded grassland, and construction of protective forest system in key regions, are being carried out. In the valley of the middle reaches of the Yarlung Zangbo River, the land has been seriously sandy. Since the 1980s, the people of all ethnic groups have made efforts for more than 40 years to afforest more than 45 million trees along the coast. Between Gongga County and Sangri County, Shannan City, a protective forest belt with a length of 160 kilometers, a width of 1.8 kilometers and an area of about 450000 mu has been formed. In 2022, the afforestation project of the north and south mountains of Lhasa was officially launched, involving 9 counties (districts) and 35 towns (streets) in the Lhasa River basin. It is planned to complete afforestation of more than 2 million mu in 10 years, and 140000 mu of afforestation has been completed in the same year. In 2022, the whole Tibet Autonomous Region will complete 1.179 million mu of afforestation and 4.375 million mu of degraded grassland restoration. In recent years, Tibet has coordinated the integrated protection and systematic management of mountains, rivers, forests, lakes, grass, sand and ice, and effectively protected the earth's third polar ecosystem. In the area with abundant water and grass in the southeast of Tibet, Nyingchi City has carried out ecological protection and restoration of important river basins such as the Yarlung Zangbo River and the Nyang River, as well as prevention and control of water and soil loss, and accelerated the establishment of a rigid constraint system for water resources; In the northern Tibetan grassland, various departments at all levels have continued to promote the return of grazing to grassland and artificial planting of grass, which has increased the coverage of grassland vegetation year by year. The Qiangtang National Nature Reserve has also implemented grid protection from the reform of management system and mechanism. At present, Tibet has set up 47 nature reserves of all kinds, and more than 80% of rare and endangered wildlife species and typical ecosystems have been effectively protected. The current forest area of the whole autonomous region is 14.91 million hectares, with a forest coverage rate of 12.3% and a comprehensive grassland vegetation coverage of more than 47%. Main rivers and lakes