saving the earth

There is air and water on the Earth。There are people,animals and plants on the Earth。People have lived on the Earth for millions of years。Many years ago,the Earth was clean。Today,there is air pollution and land pollution。People are cutting down the forests。Many plants,wild animals,birds and insects live there。People are killing animals for food and their skins。People are polluting the land,the water and the air。People must stop doing this。We must save the Earth。