ozone hole改

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1、Paragraph2---OzoneholeCarry黎小露Jane陈超然AnalysisofPara.2TheCleanAirActParagraph2---OzoneholeOzoneholeOzonehole:1）currentsituation：（1）90%ofAntarcticozonehasbeendestroyed（2）Ozone-layerabovetheArctichasreduced20%（3）ozoneovertheTibetdeclinesataspeedof2.7%everytenyears2）

2、backgroundandthecausation（1）In1930,CFCs(氟利昂)wascreatedSST（超音速航空器）stratosphere(平流层)（2）In1970s,aerotechnics（航空技术）haddevelopedremarkablyproducedmanynoxsoxh2ogasesintostratosphere(3)In1971——1980somescientistswarnedthatSSTcoulddestroyozone,butwasignored(5)In1981,twosc

3、ientistsfoundoutfromDobsonmeter(测量臭氧的标准仪器)thatOzonelayeraboveAntarcticozonewasmuchsmaller(6)In1985,theypublishedtheirdiscovery.ozoneproblemfirstseriouslydrawpeoplesattentionCausation:CFCs(氯氟烃类化学物质),NOx(氮氧化物)…ozonedepletingsubstance(耗臭氧物质）CFxCl4-x＋hv→•CFxCl3-x＋•Cl

4、Cl+O3→ClO+O2；ClO+O→Cl+O2。principlemysteriousquestion:WhyozoneholephenomenonjusthappeninAntarctic、ArcticandQinghai-TibetPlateau？Firstexplanation:circumpolarvortex环极漩涡Howcanthesegasesmovetobothpoles?earthmagneticfield地球磁场HowaboutTheQinghai-Tibetplateauozonelayer?th

5、ermodynamicprocess热力作用↓diluteozonelayer3)Influencetopeople:(1)Riskofanincreaseinskincancers(2)causecataract['kætərækt]白内障(3)Maketheimmunesystembecomesweakertotheecologicalsystem:(1)theproductionandqualityofagriculturalproductswilldecrease.(2）fisheryproductiondecr

6、eases（3）destroyforests4）defensivemeasuresIn1985,thefirstinternationalconvention(《保护臭氧层维也纳公约》)forprotectingozonehadbeenpassedthrough（1）morethan100countrieshavecollaboratedthroughinternationalaffairs:In1987,anotherinternationalconvention(《关于消耗臭氧层物质的蒙特利尔议定书》)hadbeen

7、passedthrough.In1995,establishInternationalOzoneLayerProtectionDayasSeptember16th.(2)createsubstitutionstoinsteadoftheozone-depletingsubstance(耗蚀臭氧层物质)(3)asforcommonpeople:notuseorlessusesomethingozone-depletingsubstancelikeCFCs.AnalysisofPara.21.Underlying:impor

8、tantbuthiddeneg.Scientistsaretryingveryhardtofindouttheunderlyingcausesofthedisaster.2.Crisis(pl.crises):atimeofintensedifficultyordangereg.Thecurrenteconomicc