In this world different forms of polution takes oxygen from the air, rivers and oceans. In our cities, vehicles and factories swallow oxygen, and their fumes poisons the air with carbon dioxide. This urban pollution spoil the air we breathe. It is the major cause of diseses such as lungand skin cancers. If nothing is do to reduse carbon dioxide emissions, most of us will died of these diseases. In the countryside, fertilisers wichcontains phosphorus and nitrogen spill over into rivers.
