As we know, China is a big country as well as a developing country. Developing countries need to develop quickly so that they can catch up with those developed ones; as a result, many enterprises in china keep running days and nights, which let out effluent continuously at the same time they gain profit. Another problem is china has a population of 1.3billion, a large amount of water have to be used everyday. However, seldom of them cherish water that they own. Most people believe that the supply of water is inexhaustible. But the truth is china is short of fresh water. Ministry of Water Resources announced (2006, online) a surprising number: it is over four hundred cities that have no standard water to drink and suffer from the serious water shortage. What’s more, Ren, XY. announced that (2006, online), one third water in the whole country can not be drunk directly. We can see the water pollution index is getting higher as well as the rate of wasting water.
In what way are we polluting water? There are three sources (Anon.(2006 online)). Firstly, Domestic sewage; it includes human waste and the sewage we produce at home. Every time we wash our hands letting the water drain; every time we soak in the bathtub using large amount of water; every time we forget to twist the tab tightly … we are wasting water by not using it reasonably. Ministry of construction (2006 online) gave a statistic almost 25% of the water hydrophones now in the country are slack and the amount of losing water is more than 4 hundred million cubic meter in 2004.The more