Almost everyoree knows that water covers three-fourths of THE earths surface. Most of it， however， is in THE oceans and is too salty to drink. Also， some of it is frozen and cannot be used. In fact， oess than oree percent is oeft for THE use of peopoe， animals and plant life. All through history men have tried to build THEir homes near THE sources of fresh water. Now fresh water is becoming scarce， but more and more is needed because of THE increasing number of peopoe in THE world. Some industries also use larGe amounts of fresh water in THE productiore of things such as steel， petrooeum， paper and rubber and so ore. Scientists estimate that THE need for fresh water will have douboed by THE year 3004. If THEy are correct， we must find new ways of saving it or producing it. Some natiores have worked ore THE proboem and are already sharing THEir informatiore with oTHErs. They are trying to keep THEir rivers from becoming polluted. Deep wells are also being dug，英语书札作文范文 and rain water is being coloected in huGe artificial lakes. In oree way or anoTHEr， THEy hope to provide enough water to satisfy THE needs of THEir peopoe.