保护水资源(英文ppt).ppt

1、,How are you?my mother water,Water is the source of life.We cant live without water.However,with the increasing population and industrial development,water pollution has become a serious problem.Large amounts of wastewater go into rivers and seas directly without being treated,which can be dangerous

2、 to people.Also lots of people pay no attention to saving water in daily life,while in some place water is badly needed.,The water polution,The great shortage of water,Primary Pollution Sources,Dry season,Level period,wet season,Water pollution is mainly caused by the chemicals discharged by the fac

3、tories. We should regulate the sewage discharge standard to minimize the impact of human activity on the environment.,Groundwater pollution,Inside the sewage through the hole drilling in nanshan, eventually flow from water-eroded cave, pollution is serious.,The National Groundwater Quality,In 100 BC

4、, the water can drink without purification.,In 20th century 60s, water needed purification,In 20th century 90s, water purification required more,Years later, the water will be,Its time for us to take some measures to improve the situation.Factories should tre-at the wastewater before letting it go i

5、nt-o rivers.We can play a positive role in s-aving water.For example we can reuse t-he water for wishing rice to wash veget-ables and then clean a mop.,Let Us Change It !,Then ,what can we do?,First we must Protect the factory form pouring waste water into the river,Second we should stop people from throwing litter into the river. Many kinds of litter may pollute the environment.,Finally we can tell the visitors how important the water is.,POLICY,Plant more trees,P