acid-rain酸雨英文版PPT文档格式.ppt

1、Chapter 1,The definition of acid rain,“Acid rain”is a broad term used to describe several ways that acids fall out of the atmosphere.A more precise term is acid deposition（沉积物）,which has two parts:#wet and dry.It can do harm to plants,aquatic animals,and infrastructure（基础设施）.,Wet Deposition-is the p

2、rocess by which acids with a pH below 5.6 are removed from the atmosphere in the form of rain,snow,sleet,and mist.Dry Deposition-occurs when particles such as volcanic ash,sulphates,and nitrates are deposited onto a surface and are then converted into acids when they contact water.,Chapter 2,The aci

3、d rain in china,Places significantly impacted by acid rain around the globe Include China,Especially the central and southwest regions of China.,In 1980smainly in Si Chuan Province,Gui Zhou Province,Guang Xi Province and Guang Dong Province,approximately 1,700,000 kilometers.In the middle of 90sspre

4、aded over 2,000,000 kilometers,Now Chang Sha,Gan Zhou,Nan Chang and Huai Hua are the most severe affected areas in China acid rain rate is over 90%.Regions beside Yellow River are the other main areas of acid rainAcid rain has covered more than 30%of the whole land in China,Chapter 3,The cause of ac

5、id rain,Scientists discovered,and have confirmed,that sulfur dioxide（SO2）and nitrogen oxides（NOx）are the primary causes of acid rain.In the US,About 2/3 of all SO2 and 1/4 of all NOx comes from electric power generation that relies on burning fossil fuels like coal.,Acid rain occurs when these gases

6、 react in the atmosphere with water,oxygen,and other chemicals to form various acidic compounds.Sunlight increases the rate of most of these reactions.The result is a mild solution of sulfuric acid and nitric acid.,Causes of Acid RainSulfur dioxide and nitrogen oxides（二氧化硫和氮氧化物）,Natural cause,FireVo

7、lcano eruptionBacterial decompositionLightning,Volcano eruption,lightning,Bacterial decomposition,fire,Human activities,Vehicle gasesFossil fuels,Industrial Productioncivilian life,Vehicle gases,Fossil fuels,Industrial Production,civilian life,The main cause of acid rain,Chapter 4,The influence and

8、solutions,The influence?#,3,2,1,Also,the influence include that:#Surface waters and aquatic animalsForests and soilAutomotive coatingsMaterials（metals,buildings,statues）VisibilityHuman health,The epilogue,solution,China1.Improve the environmental laws and regulations,strengthen supervision（监督）and ma

9、nagement2.Adjust the energy structure,improving combustion technology（燃煤技术）3.Improve the traffic environment,control vehicle exhaust（排气；#废气）4.To strengthen afforestation（植树造林）,to expand the green area5.Limit the total area of SO2 emissions（排放量）6.Increase public participation,The United States and ot

10、her developed countries1.International treaties（条约）A number of international treaties about atmospheric pollution have been agreed.Canada and the US signed the Air Quality Agreement in 1991.Most European countries and Canada have signed the treaties.,2.Emissions（排污权）trading Emissions trading is a ma

11、rket-based approach used to control pollution by providing economic incentives（动机；#刺激）for achieving reductions in the emissions of pollution3.Improved automotive engine technology,installation of exhaust gas purification（净化）device to reduce emissions of nitrogen oxides.,What can we do?#,Turn off lig

12、hts,computers,and other appliances when youre not using them.2.Use energy-efficient appliances:#lighting,air conditioners,heaters,refrigerators,washing machines,etc.3.Limit the use of air conditioners,4.Use public transportation,or better yet,walk or bicycle whenever possible5.Buy vehicles with low NOx emissions,and properly maintain your vehicle.,Thank you,