Advise students to trash 150 words.

Littering is a common phenomenon, and some people may not know it. If this continues, the natural environment will be seriously damaged. Let's calculate that if people all over the world throw rubbish once a day, we can imagine what the earth will become.

Littering not only pollutes the environment, but also brings serious harm to human beings. People's stomach cancer, esophageal cancer, intestinal cancer and other diseases are all related to littering. Because people go out for activities or go to work every day, some garbage will rot for a long time and give off a bad smell. People will get sick if they inhale these smells for a long time. Garbage can also breed many bacteria, attract mosquitoes and spread diseases. In order to avoid littering, we have to start with the little things around you. In fact, it is very simple to deal with garbage correctly. Wherever there is a trash can, some people are lazy. They just put the garbage on the ground and walk to the trash can. When we meet such people, we should remind them or take the initiative to pick up garbage. If everyone can do this, the pollution of garbage to the environment will be greatly reduced, and people's diseases will be reduced, which will bring us a lot. Let's join hands and contribute to protecting the environment and creating a beautiful home for mankind!