2019-2020年高考英语一轮复习 Unit4 Global warming导学案 新人教版选修6

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1、2019-2020年高考英语一轮复习Unit4Globalwarming导学案新人教版选修6ReadingTHEEARTHISBEINGWARMER—BUTDOESITMATTER?Duringthe20thcenturythetemperatureoftheearthroseaboutonedegreeFahrenheit.Thatprobablydoesnotseemmuchtoyouorme,butitisarapidincreasewhen___1_____(pare)toothernaturalchanges.Sohowhasthiseabout

2、anddoesitmatter?EarthCare’sSophieArmstrongexploresthesequestions.Thereisnodoubtthattheearthisbeingwarmer(seeGraph1)andthatitishumanactivitythathascausedthisglobalwarmingratherthanarandombutnaturalphenomenon.Allscientistssubscribetotheviewthattheincreaseintheearth’stemperatureisdue

3、totheburningoffossilfuelslikecoal,naturalgasandoiltoproduceenergy.Somebyproductsofthisprocessarecalled“greenhouse”gases,themostimportantoneofwhichiscarbondioxide.DrJaniceFosterexplains:“Thereisanaturalphenomenonthatscientistscallthe‘greenhouseeffect’.Thisiswhensmallamountsofgasesi

4、ntheatmosphere,likecarbondioxide,methaneandwatervapour,trapheatfromthesunandthereforewarmtheearth.Withoutthe‘greenhouseeffect’,theearth_____2________(be)aboutthirty-threedegreesCelsiuscoolerthanitis.So,weneedthosegases.Theproblembeginswhenweaddhugequantitiesofextracarbondioxideint

5、otheatmosphere.Itmeansthatmoreheatenergytendstobetrappedintheatmospherecausingtheglobaltemperaturetogoup.”Weknowthatthelevelsofcarbondioxide_____3_____(increase)greatlyoverthelast100to150years.ItwasascientistcalledCharlesKeeling,whomadeaccuratemeasurementsoftheamountofcarbondioxid

6、eintheatmospherefrom1957to1997.Hefoundthatbetweentheseyearsthecarbondioxideintheatmospherewentupfromaround315partstoaround370partspermillion(seeGraph2).Allscientistsacceptthisdata.Theyalsoagreethatitistheburningofmoreandmorefossilfuelsthathasresultedinthisincreaseincarbondioxide.S

7、ohowhighwillthetemperatureincreasego?DrJaniceFostersaysthatoverthenext100yearstheamountofwarmingcouldbeaslowas1to1.5degreesCelsius,butitcouldbeashighas5degrees.However,theattitudesofscientiststowardsthisrisearepletelydifferent.Ontheonehand,DrFosterthinksthatthetrendwhichincreasest

8、hetemperatureby5degreeswouldbeaca