急！！！！！环保知识竞赛主持开场白和结束语（英语）

Global Shortage of Fresh Water
People often think that water will never be used up.There is plenty of water,suc h as rain,water from the rivers and wells,It seems as if water is always availab le around us and we never have to worry about water shortage.
In fact water is rather limited on the earth.With the rapid increase of populati on and fast development of industries,water is more needed than before.At the sa me time,a large amount of water has been polluted and wasted every day.Some big cities in China are facing the problem of water shortage already.There,water sup ly is controlled and industry has been restrained.
What should we do about the water shortage?I think,first,the people should be ma de aware of the real situation about the water.Everyone should consciously save on water and certain law should be made that no water will be polluted.We have t o protect the existing water resources and develop new ones.In this way Ibelieve that our cities will be thi