As it is known, pollution, regardless of whether it is found in the sea or air, is one of the worst phenomenons in the world. whether it is be sea and weather pollution or any thing else, air, or any other type. For example, at schools we see a lot of students through some throw papers, plastic bags, and empty cans of juices on the floor, having forgotten cleaning mannersto clean up after themselves;, so we need badly to give schools students some advice on how to avoid pollution dangers littering. 

Also, we should put many various trashes cans at certain some pleases places or corners at school. One of them should be for wastes, the second for papers, the third for empty cans and so on...