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1、Unit8FocusonGlobalWarmingKeytotheExercisesTextcomprehensionI.AII.l.T;2.T;3.F;4.F;5.F.III.1.Paragraph2.Becauseglobalwarmingmaybethesinglelargestthreattoourplanet(theearth)•Low-lyingnationscouldbeawashinseawater,rainanddroughtpatternsacrosstheworldcouldchange,hurricanescouldbecomemorefrequent,andEl
2、Ninoscouldbecomemoreintense.2・Paragraph3.Ourfactories,powerplants,andcarsburncoalandgasolineandspitoutcarbondioxide,producemethanebyallowingourtrashtodecomposeinlandfillsandbybreedinglargeherdsofmcthanc-bclchingcattle,andreleasenitrogenoxidebyusingnitrogen-basedfertilizers.3.Paragraph4.Theincreas
3、edconcentrationsofgreenhousegasespreventadditionalthermalradiationfromleavingtheEarth,socausetheglobalwarming・4.Paragraph7.Aslightincreaseinheatandraininequatorialregionswouldincreasevcctor-borncdiseasessuchasmalaria;moreintenserainsandhurricanescouldcausemoreseverefloodingandmoredeathsincoastalr
4、egionsandalongriverbeds;evenamoderateriseinsealevelcouldthreatenthelow-lyingislands;hottersummerscouldleadtomorecasesofheatstroke,hospitaladmissionsanddeathsamongvulnerablepeoplewithheartproblemsorrespiratoryproblems・5・Paragraph8and10.Wecancurbourconsumptionoffossilfuelsandusetechnologiestoreduce
5、theemissionofheat-trappinggaseslikecarbondioxide,methane,andnitrousoxides,andprotecttheforestsintheworld,andwecanalsoadvocatepoliciesthatwillcombatglobalwarmingoverthelongterm,thingslikecleancars,environmentallyresponsiblerenewableenergytechnologies,andstoppingtheclear-cuttingofvaluableforests.IV
6、.1.GlobalwarmingwillprobablybethemostseriousthreattoourEarth,ifwedonottakeintoaccountofsomeotherpossibledisasters,suchasanotherworldwar,collisionofourEarlhwithsomesmallorbitingplanet,orspreadofincurablediseases.2.Intermsofhumanhealth,thepeopleofthepoorercountrieswillsuffermost,becausetheircountri
7、esdonothavemoneytoprotectthemwhenclimatechanges・StructuralanalysisSub-ideasinthesecondpart:1)thecausesoftherisingconcentrationofgreenhousegasesintheatmosphere(Paragraphs3and4)2)theeffectofsuchconcentrationonclimatechan
