中科院和相关部门的监测评估显示，西藏高原各类生态系统结构整体稳定，生态质量稳定向好。西藏生态系统类型拥有除海洋生态系统之外的所有陆地生态系统类型，仍然是中国和全球重要的生物物种基因库和生物多样性保护重点地区。水、气、声、土壤、辐射及生态环境质量均保持良好状态，全区的江河、湖泊、森林、草场、湿地、冰川、雪山和野生动植物等都得到了有效保护，大部分区域仍处于原生状态。

　　结束语

　　过去的50年，在中国共产党和中央政府的坚强领导下，通过实行民族区域自治制度，西藏从落后走向进步，从贫穷走向富裕，从封闭走向开放，社会制度实现了历史性跨越，社会面貌发生了翻天覆地的变化。实践充分证明，实行民族区域自治制度，是西藏历史发展和社会进步的客观要求，符合西藏各族人民的根本利益。民族区域自治制度，完全适合中国国情和西藏地方的实际，是西藏发展进步的正确选择。

As the surveys and evaluations of the Chinese Academy of Sciences and relevant departments show, Tibet Plateau boasts a stable and balanced ecological system with a stable eco-quality. Encompassing all terrestrial ecosystems, the Tibetan ecosystems remain important gene pools of China and the entire globe's biological species, and a key area for biodiversity conservation. Its water, air, noise, soil, radiation, and ecological and environmental quality all remain in good condition, and its rivers, lakes, forests, grasslands, wetlands, glaciers, snow mountains, and wildlife are all under effective protection, most in the Region maintaining their original natural state.

Conclusion

Over the past 50 years, under the firm leadership of the CPC and the central government, great changes have taken place in Tibet through implementing regional ethnic autonomy, achieving a historical leapfrog from a backward, impoverished, and isolated society into one which is now progressing, prospering, and open. Practice has fully demonstrated that regional ethnic autonomy is a requirement for Tibet's development and progress, and conforms to the fundamental interests of all ethnic groups in Tibet. This system fits China's national conditions and the reality of Tibet, and is thus the right choice for Tibet.