英语--水污染.ppt

There are different problems around us ,such as prices rising , high house price and others . we also know that food safety , such as Dyeing steamed bread , poisonous milk powder, which threat to our lives. The Dian lake In recent years, the Dian lake become rich nutritional , the color of water become dark yellow or green. And organic pollution was serious, nitrogen(氮), phosphorus（磷） and arsenic（砷） deposit on the bottom of lake,which promotes the growth of algae(蓝藻) or eichhornia crassipes（凤眼莲). Reasons 1、 With the rapid growth of economy , emissions of production and living have exceeded environmental bearing capacity. 2、 The imbalance of insufficient water resources and high demand results in a vicious cycle. 3、All kinds of emissions of pollutants and severe soil erosion lead to ecological environment deterioration . 4、the pollution of township enterprises has not been effective controlled. Solutions 1 、 It is prohibited to discharged industrial and living sewage directly into dian lake. three or four sewage treatment station are needed . 2、 Everyone should participate in the prevention and control work actively. 3、 Do some research about the growth of algae and its inhibition mechanism ,then take positive measures, this is what we students should do at present. Fortunately, in recent years, the government and people have realized the dangers of the pollution of the dian lake, and then they take active measures to save the bad situation. Now the government has invested lots of money to treat water pollution and there are preliminary effects which lives up to expectations. The Dian lake after governance We need to alert this： If we do not protect the environment and control pollution ,one day in the future we will do like this ……. looking forward to the future We believe that the Plateau Pearl will withstand the baptism of pain through our continuous efforts , as long as there are appropriate