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I used to live in a sweet small town with green trees all round it. The river, going through the central of my town, is extremely clean in which you can see fishes swimming in groups. The houses were quite simple and crude lining along narrow streets.Residents worked very hard, but they had very poor life. However everything is changed today. Skyscrapers, stores, factories can be found everywhere and plenty of vehicles are running in the streets. As all know, everything has two sides, positive and negative. with the development of industry, our environment becomes worse than I was young. A lot of trees are cut down and fishes are disappear. if let these things go on, our life quality will be lower than before. So now our priority is to deal with the problem of pollution to give our people a blue sky, a clean river and fresh air.