acid-rain酸雨英文版PPT文档格式.ppt

acid-rain酸雨英文版PPT文档格式.ppt

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Chapter1,Thedefinitionofacidrain,“Acidrain”isabroadtermusedtodescribeseveralwaysthatacidsfalloutoftheatmosphere.Amoreprecisetermisaciddeposition（沉积物）,whichhastwoparts:

@#@wetanddry.Itcandoharmtoplants,aquaticanimals,andinfrastructure（基础设施）.,WetDeposition-istheprocessbywhichacidswithapHbelow5.6areremovedfromtheatmosphereintheformofrain,snow,sleet,andmist.DryDeposition-occurswhenparticlessuchasvolcanicash,sulphates,andnitratesaredepositedontoasurfaceandarethenconvertedintoacidswhentheycontactwater.,Chapter2,Theacidraininchina,PlacessignificantlyimpactedbyacidrainaroundtheglobeIncludeChina,EspeciallythecentralandsouthwestregionsofChina.,In1980smainlyinSiChuanProvince,GuiZhouProvince,GuangXiProvinceandGuangDongProvince,approximately1,700,000kilometers.Inthemiddleof90sspreadedover2,000,000kilometers,NowChangSha,GanZhou,NanChangandHuaiHuaarethemostsevereaffectedareasinChinaacidrainrateisover90%.RegionsbesideYellowRiveraretheothermainareasofacidrainAcidrainhascoveredmorethan30%ofthewholelandinChina,Chapter3,Thecauseofacidrain,Scientistsdiscovered,andhaveconfirmed,thatsulfurdioxide（SO2）andnitrogenoxides（NOx）aretheprimarycausesofacidrain.IntheUS,About2/3ofallSO2and1/4ofallNOxcomesfromelectricpowergenerationthatreliesonburningfossilfuelslikecoal.,Acidrainoccurswhenthesegasesreactintheatmospherewithwater,oxygen,andotherchemicalstoformvariousacidiccompounds.Sunlightincreasestherateofmostofthesereactions.Theresultisamildsolutionofsulfuricacidandnitricacid.,CausesofAcidRainSulfurdioxideandnitrogenoxides（二氧化硫和氮氧化物）,Naturalcause,FireVolcanoeruptionBacterialdecompositionLightning,Volcanoeruption,lightning,Bacterialdecomposition,fire,Humanactivities,VehiclegasesFossilfuels,IndustrialProductioncivilianlife,Vehiclegases,Fossilfuels,IndustrialProduction,civilianlife,Themaincauseofacidrain,Chapter4,Theinfluenceandsolutions,Theinfluence?

@#@,3,2,1,Also,theinfluenceincludethat:

@#@SurfacewatersandaquaticanimalsForestsandsoilAutomotivecoatingsMaterials（metals,buildings,statues）VisibilityHumanhealth,Theepilogue,solution,China1.Improvetheenvironmentallawsandregulations,strengthensupervision（监督）andmanagement2.Adjusttheenergystructure,improvingcombustiontechnology（燃煤技术）3.Improvethetrafficenvironment,controlvehicleexhaust（排气；@#@废气）4.Tostrengthenafforestation（植树造林）,toexpandthegreenarea5.LimitthetotalareaofSO2emissions（排放量）6.Increasepublicparticipation,TheUnitedStatesandotherdevelopedcountries1.Internationaltreaties（条约）Anumberofinternationaltreatiesaboutatmosphericpollutionhavebeenagreed.CanadaandtheUSsignedtheAirQualityAgreementin1991.MostEuropeancountriesandCanadahavesignedthetreaties.,2.Emissions（排污权）tradingEmissionstradingisamarket-basedapproachusedtocontrolpollutionbyprovidingeconomicincentives（动机；@#@刺激）forachievingreductionsintheemissionsofpollution3.Improvedautomotiveenginetechnology,installationofexhaustgaspurification（净化）devicetoreduceemissionsofnitrogenoxides.,Whatcanwedo?

@#@,Turnofflights,computers,andotherapplianceswhenyourenotusingthem.2.Useenergy-efficientappliances:

@#@lighting,airconditioners,heaters,refrigerators,washingmachines,etc.3.Limittheuseofairconditioners,4.Usepublictransportation,orbetteryet,walkorbicyclewheneverpossible5.BuyvehicleswithlowNOxemissions,andproperlymaintainyourvehicle.,Thankyou,