So far, Tibet's nature reserves have covered 413,700 sq km, or over 1/3 of the region's land area, ranking first in China, according to the press conference of Tibet People's Government on May 31, 2011.
Located at an average altitude of over 4,000 m, Tibet Autonomous Region, covering over 1.2 million sq km, boasts a unique natural ecological and geographical environment.
Since its peaceful liberation in 1951, Tibet has attached great importance to environmental protection and construction with no environmental pollution accidents occured in its nature reserves.
Tibet has made rapid progress in the construction of environmental legal system, eco protection, pollution control, research and monitoring, environmental protection education, etc., effectively promoting the coordinated development of Tibet's economy, society and environment, said Ma Jinglin, a spokesman from the press conference.
A survey showed that Tibet has always reported good quality water, air, sound, soil, radiation and eco-environment.
Tibet, basically in a natural primordial state, remains one of the most environment-friendly regions in the world.