Our surroundings are being polluted fast and man's present efforts cannot prevent it. Time is bringing us more people, and more people will bring us more industry, more cars, larger cities and the growing use of man-made materials. The drawing sets us thinking too much due to its far-reaching influence。 Nowadays, though the awareness of protecting environment is being accepted by more and more people, we can still see many unpleasant scenes especially in scenic spots. Why does this phenomenon arise? Many factors are accounting for it. First and foremost, to some people, the consciousness of protecting environment is still not so strong. They may not think it is a big deal to throw rubbish everywhere. In addition, the environmental management system isn’t so satisfying. For example, in some places there’re few regulations or the implementation is seldom performed actually。