Rare is the nature of non-renewable resources, China for the protection of the environment and limit the export of rare earth resources is in line with WTO rules was not a deliberate distortion of rules to protect domestic industries.China currently supplies more than 90 percent of the world's rare earth consumption, but also end up paying a huge environmental cost, and the United States as early as 1997 closed the country's largest rare earth mine Mountain Pass. Rare as non-renewable resources, unlimited use of eventually not a permanent solution, is to develop alternative sources of rare earth now imperative.