Water is our life source. It makes up 70% of our bodies, and the average person usually spends 18 months of his life in the bath or shower.
But we are only now learning how to look after water. Acid rain has polluted as many as 18.000 lakes and our seas. And rivers are polluted with waste products. It is now very expensive to try to repair the damage which has been done. We have some hope for the future, though, because new sources of water have been discovered. People living in the Sahara Desert have found fish swimming in deep underground streams. Scientists also believe there is a huge lake underneath London. If we have learnt anything from our mistakes, we will try to keep these new areas of water clean.