I was born a small acient town with beatuifl secenery. In the past, there were many trees planted on each side of the street. Fish swimed lightheartedly in the clear river. Although the houses were simple and crude, the streets were narrow and life was poor, people's life was simple and happy. With the social and economic development, the town has been taken a great change. Nowadays, a lot of high buildings and large mansions are built and many vehicles driving on the street. Moreover, the industrial development make the enviornmental degradation, trees reduction and fish disappearance. Therefore, what we need to do first now is to deal with pollution.