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成员：许睿萍朱晶华张秀梅O3iscomposedofthreeoxygenatomstheozonelayer.O3couldabsorbultraviolet(紫外线)inthesunlight,andprotectthegroundlivingorganismsfromultravioletdamageOzone：•Ozoneisoxygenallotropes(同素异形体).Inroomtemperature,itisakindofspecialodorbluegas.Ozonemainlyexistsintheearth‘ssurfacefrom20kilometersofstratospheric(同温层的)ozonelayerinthelowerpart.Itabsorbsshort-wavedultravioletrays(紫外线)whichareharmfultohumanbody,preventingtheirreachingtheearth.•Widelyusedinfoodpurification,drinkingwaterpurification,disinfectionsterilization(消毒杀菌),airpurification,bath,beauty,healthcare...Ozonehole:1）Currentsituation：（1）90%ofAntarctic【南极的】ozonehasbeendestroyed（2）Ozone-layerabovetheArctic【北极】hasreduced20%（3）ozoneovertheTibet【西藏】declinesataspeedof2.7%everytenyearsWhatwillhappenifthereisnoozoneintheatmosphere?3)Influencetopeople:(1)Riskofanincreaseinskincancers(2)causecataract['kætərækt]白内障(3)Maketheimmunesystembecomesweakertotheecologicalsystem:(1)theproductionandqualityofagriculturalproductswilldecrease.(2）fisheryproductiondecreases（3）destroyforestsChangesofAntarcticozoneholefrom1945to1995•CFCusedas•refrigerant(制冷剂)•blowingagent(发泡剂)•cleanagent(清洗剂)•Widelyusedin•householdappliances•foamplastics•chemicals•automotive•firefightingequipmentDefensivemeasuresIn1985,thefirstinternationalconvention(《保护臭氧层维也纳公约》)forprotectingozonehadbeenpassedthrough（1）morethan100countrieshavecollaborated【合作、协作、沟通】throughinternationalaffairs:In1987,anotherinternationalconvention(《关于消耗臭氧层物质的蒙特利尔议定书》)hadbeenpassedthrough.In1995,establishInternationalOzoneLayerProtectionDay【国际保护臭氧层日】asSeptember16th.(2)createsubstitutions【代替、替代物】toinsteadoftheozone-depletingsubstance(耗蚀臭氧层物质)(3)asforcommonpeople:notuseorlessusesomethingozone-depletingsubstancelikeCFCs【氯氟烃Chlorofluorocarbons】.•A.tacklewithwasterefrigeratorsandelectrical•B.Purchasethoseproductswiththelogoofno-CFCs•C.Thegovernmentshouldmakepolicies•D.TellthesurroundingpeopleoftheimportancetoprotecttheozonelayerMyAdvicesfordealingwithCFCs