Saving tress in our life is very important.Tress give us oxygen.Humans cutting trees for there development to built there buildings.Smoke coming from factories harming air water and tress also.Small animals and birds losing there houses.Polloution coming from cars.Cutting tress and making! roads.Why?Why we cannot planting tress intsead of cutting?Tress provide us everything and we provide tress,what?Polloution and Smoke only.Why we cannot give those borde a better life to live.In your science book,you read about saving tress but today no one is saving just cutting.That's why the level of oxygen is decreasing.SAVE TRESS! SAVE EARTH!Thanks!