英语介绍臭氧-臭氧的利弊课件

OzoneHole成员：许睿萍朱晶华张秀梅OzoneHole成员：许睿萍1WhatareO3andtheozonelayer?O3iscomposedofthreeoxygenatomstheozonelayer.WhatareO3andtheozonelaye2ThefunctionoftheozonelayerO3couldabsorbultraviolet(紫外线)inthesunlight,andprotectthegroundlivingorganismsfromultravioletdamageThefunctionoftheozonelaye3Ozone：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...Ozone：Ozoneisoxygenallotrop4Ozonehole:

1）Currentsituation：（1）90%ofAntarctic【南极的】ozonehasbeendestroyed（2）Ozone-layerabovetheArctic【北极】hasreduced20%

（3）ozoneovertheTibet【西藏】declinesataspeedof2.7%everytenyears

Ozonehole:1）Currentsituatio5Whatwillhappenifthereisnoozoneintheatmosphere?Whatwillhappenifthereisn6英语介绍臭氧-臭氧的利弊ppt课件7英语介绍臭氧-臭氧的利弊ppt课件83)Influence

topeople:(1)Riskofanincreaseinskincancers

(2)causecataract['kætərækt]白内障(3)Maketheimmunesystembecomesweaker

totheecologicalsystem:(1)theproductionandqualityofagriculturalproductswilldecrease.(2）fisheryproductiondecreases（3）destroyforests3)Influencetopeople:(1)Ris9TheAntarcticozoneholeChangesofAntarcticozoneholefrom1945to1995TheAntarcticozoneholeChange10CFCusedasrefrigerant(制冷剂)blowingagent(发泡剂)cleanagent(清洗剂)WidelyusedinhouseholdappliancesfoamplasticschemicalsautomotivefirefightingequipmentCFC--killeroftheozonelayer

CFCusedasCFC--killer11Defensivemeasures

In1985,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.DefensivemeasuresIn1985,the12(2)createsubstitutions【代替、替代物】toinsteadoftheozone-depletingsubstance(耗蚀臭氧层物质)(3)asforcommonpeople:notuseorlessusesomethingozone-depletingsubstancelikeCFCs【氯氟烃Chlorofluorocarbons】.(2)createsubstitutions【代替、替代物13A.tacklewithwasterefrigeratorsandelectricalB.Purchasethoseproductswiththelogoofno-CFCsC.ThegovernmentshouldmakepoliciesD.TellthesurroundingpeopleoftheimportancetoprotecttheozonelayerMyAdvic