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Unit4GlobalWarmingWhatcausestheglobalwarming?Isglobalwarmingcausedbyarandomnaturalphenomenon?Whatcausesglobalwarming?Thingsthatuseenergyaroundusoratanyotherplaces:InahouserefrigeratorOverpopulationsmokefromfactoriesDeforestationanddesertification采伐森林沙漠化Itis___________thathasresultedinglobalwarming.humanactivityenergyWindenergyisusedaspowertoproduceelectricity.Windmills风车whereelectricityisproducedbyburningcoals.Thecoalpowerstations煤炭发电站inwhichoilisrefined（提炼）andmadepure（纯净）.TheOilRefineriesafacility（设备）designedtoconvert（转化）nuclearenergyintoelectricity.Anuclearpowerplant核电站ontheroofofahouseonabrightsunnydayareusedtocollectsolarenergy,makingyourhousewarmorheatingyourwater.Solarpanels太阳能板areusedtokeepbackwaterandraiseitslevelforirrigation(灌溉)orforproducingelectricity,etc.TheHydro-electricdams水电大坝Renewableornon-renewable?√Renewableornon-renewable?√•Coal•Oil•Naturalgas•Wind(windpower)•Sun(solarenergy)•Water(hydro-electricpower)•Hotspringsorgeysers(间歇泉)•Thesea(tidalenergy潮汐能)•plantwaste(biomassenergy生物质能)FossilfuelsNon-renewableRenewablecarbondioxideFossilFuelcoaloilgasglobalwarming●●●●●●produceFossilfuel(化石燃料):Ancientanimalandplantmaterialbelowthesurfaceoftheearthwithahighcarboncontent,suchascoal,oilandnaturalgas,whichcanbeburnttoproduceenergy.Alsoknownasnon-renewableenergybecauseoncetheyareusedtheyhavegoneforever;theycannotberenewed.Greenhousegases!•Whatarethegreenhousegases?•What’sgreenhouseeffect?•Whatarethe“greenhousegases”?Intheatmospheresurroundingtheearththerearegases,whicharecalledgreenhousegases,includingcarbondioxide,methane(甲烷,沼气)andwatervapor.•What’sthegreenhouseeffect?Itisanaturalphenomenon.Thegreenhousegasestrapheatfromthesunandthereforewarmtheearth.burningfossilfuelsmoreheattrappedresultinbyproductmoreCO2GlobalWarmingGreenhouseWhatisagreenhouse?Agreenhouseismadeofglassandisusedforgrowingplants,especiallyduringcoldweather.•Howdoesgreenhousework?Theglasstraps（困住）theheatfromthesunandkeepsitfromescaping.Thismakesthegreenhouseheatup，sotheplantscangrowinthecoldperiod.Theeffectsofglobalwarming•Negativeeffects:1causethesealeveltorise;2severestorms;3flood4droughts;5famine(饥荒);6destructionofspeciesTheeffectsofglobalwarming•Positiveeffects:1makeplantsgrowfaster;2cropswillproducemore;3makelifebetterTheEarthisBecomingWarmer---ButDoesItMatter?ReadingListentothepassagePayattentiontothestructureofthepassage.Howtodividethepassageintofourparts?Para.1Para.2-5IIIPara.6IIIPara.7IVIntroductionBodyConclusion引言主体结论StructureMainideaofeachpartPart1(1)B.Introduceadebateovertheissueofglobalwarming.Part2(2-5)A.Howglobalwarmingcomesabout.D.Listtwodifferentattitudesamongscientiststowardsglobalwarming.C.It’suptoreaderstothinkanddecidewhetherpeopleshoulddosomethingaboutglobalwarmingornot.Part4(7)Part3(6)1.afact?2.aquestion?Part.I(1)Answerthequestions.Duringthe20thcenturythetemperatureoftheearthroseaboutonedegreeFahrenheit.Sohowhasthiscomeaboutanddoesitmatter?Introduceadebateovertheissueofglobalwarming.Part.II(2-5)Howglobalwarmingcomesabout.1.Everyonebelievesthatglobalwarmingiscausedbythe_______________.humanactivities2._____hascausedtheincreaseincarbondioxide.A.Theburningofmoreandmorefossilfuels.B.Thenaturalphenomenon.AGraphIshowsthe____________increaseofonedegreeFahrenheitbetween1860to2000.Whatisthegraphabout?temperatureWhatisthegraphabout?Graph2showsthe________________contentintheatmospherefrom1957to1997.carbondioxidePart.II(2-5)Howglobalwarmingcomesabout.Theriseincarbondioxideiscausingasteadyincreaseintemperature.burningfossilfuelsmoreheattrappedresultinbyproductmoreCO2GlobalWarmingPart.III(6)Listtwodifferentattitudesamongscientiststowardsglobalwarming.Thenwewilldoaninterview,IwillbearepoterandtwoofyouwillbeDrFosterandGeorgeHambleyinterviewDrJaniceFosterGeorgeHambleyDr.JaniceFosterGeorgeHambleyCarbondioxidehascausedtheglobaltemperatureto__________.Thetrendwhichincreases5degreeswouldbea____________andcouldbe______________.Morecarbondioxideisa__________thing,whichmakescrops______________andwillencouragegoupcatastropheveryseriouspositiveproducemoreagreater______ofanimalsrangeDr.JaniceFosterPKGeorgeHambleyPartIV(7)Doesitmatter？Greenhousegasescontinuesto_________intheatmosphere._________westartreducingtheamountofgreenhousegases,theclimate________warming.Nooneknowsthe_______ofglobalwarming.buildupEvenifkeepsoneffectsSummaryThispassageaimsatshowingushowglobalwarming____________.__________________hascausedthisglobalwarming.Italsointroducestwodifferent_________ofscientiststowardstheincreaseoftemperature.Dr.JaniceFosterthinksthatitisa_________(消极的）thing.Dr.Hambleythinksthatitisa_______thing.However,nooneknowstheexacteffectsofglobalwarming.comesaboutattitudesnegativepositiveHumanactivity