In the past, there were a lot of green trees around my hometown, fishes were found playing in the small river, the houses were simple and the roads were narrow, the people were poor. but now,there are a lot of high buildings of factories and shops at the orginal places, various cars were found on the streets, the enviroment is changing worse, the trees are cutting down and fishes are disappearing, so to deal the problem of enviroment pollution is a big deal asap.