There was a extreme weather annoyed the people who live in northwest of China thoughout the past two seasons. It was sandstorm. The sandstorms happened more frequently than before, even happened in summer. The reasons of creating sandstorms are very complex, but there are two essential factors must be had when a sandstorm occurs. one is a large tract of land without enough plants or grass, the other is cold air. When a cold air meets a hot air in spring that will makes a big wind, the wind will brings plenty of sand into the air and spreads them to other areas. As far as I know, since the people who have been living on the grasslands for thousands years found that there were a lot of mines under the ground, some of them began to mine coal, oil or tombarthite instead of nomadism. We admit that the benefit from mines is usually many times as much as it gets from graziery. But the lands which have been broken are really hard to recovered. The result is that some people made enough money to move to a great place to enjoy life, the people who left or live around the area will suffer from extreme weather and worse living conditions. Fortunately, my country forbids anyone to break the ecosystem to get benefit. But we can't stop others who live abroad to do the unadvisable things. The global environmental problems need to be solved by the whole world. If someone are protecting the globe, and others are destroying it, we can just shut up and stop complaining the bad environment.