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Unit4GlobalWarmingReadingleadinCanyouthinkofsomenaturaldisasters(自然灾害)becauseoftheextremeheat(酷暑)?drought(旱灾)fireTheEarthisBecomingWarmer--ButDoesItMatter?地球在变暖——要不要紧？ReadingWordsandexpressionstemperature温度onedegreeFahrenheit华氏一度explore探索humanactivities人类活动phenomenon现象subscribeto同意，赞成fossilfuels矿物燃料byproduct副产品“greenhouse”gases温室气体atmosphere大气methane甲烷，沼气degreeCelsius摄氏度quantitiesof大量的accuratemeasurements精确的测量data资料，数据catastrophe大灾难beopposedto反对environmentalconsequences环境影响agreatrangeof大量的evenif即使keepon继续ScanningWho：_____________Threescientists:____________________________SophieArmstrongDrJaniceFoster;CharlesKeeling;GeorgeHambley;Whatarethetwographsabout?Graph1showsthetemperaturedifference(温度差异)from1860to2000.Graph2showsthecarbondioxidecontent(二氧化碳含量)intheatmospherefrom1957to1997.Graph1:Graph2:Paragraph1Paragraphs2&5Paragraph6Part1Part2Part4MainideaofthetextPart3Paragraph7Howglobalwarmingcomesabout?(全球变暖是怎样产生的)Twodifferentopinionsaboutglobalwarming.Theearthisbecomingwarmer.Shouldwedoanything?1.Duringthe20thcentury,thetemperatureoftheearthdidn’tseemtoincreasemuch.2.Thereisnodoubtthatglobalwarmingiscausedbythehumanactivities.3.Notallscientistsbelievethattheincreaseintheearth’stemperatureisduetotheburningoffossilfuels.Trueorfalse4.Thelevelsofcarbondioxidehaveincreasedgreatlyoverthelast100—150years.5.GeorgeHambleybelievesthatglobalwarmingwilldogoodtotheearth.6.Weknowtheeffectsofglobalwarming.Howhasglobalwarmingcomeabout(产生)?1.HumanactivityTheproblembeginswhenhugequantitiesofextracarbondioxide(大量的二氧化碳)areaddedintotheatmosphere.…isduetotheburningoffossilfuels…2.GreenhousegasesParagraph2&3carbondioxideFossilFuel(矿物燃料)coaloilgasglobalwarming●●●●●●produce二氧化碳Haveyoueverseenagreenhouse?Methane['mi:θein]WhatareGreenhousegases?Therearegasescalled“greenhousegases”,including…CarbondioxideWatervapourTheytraptheheatfromthesunandwarmtheearth.Para4.thelevelsofcarbondioxidehaveincreasedgreatlyoverthelast100to150years1.Whomadeaccuratemeasurementsoftheamountofcarbondioxide?2.Howmuchhasincreased?CharlesKeelingThecarbondioxideintheatmospherewentupfromaround315partstoaround370partspermillion.Para5.Howhighwillthetemperaturego?Theamountofwarmingcouldbeaslowas1to1.5degreesCelsius,butitcouldbeashighas5degrees.Dr.Foster:_____________________GeorgeHambley:_________________Whatdothescientiststhinkaboutglobalwarming?Dotheyagreewithoneanother?Itwouldbeacatastrophe.weshouldnotworryaboutit.Theyhavequitedifferentattitudestowardsthisissue.Paragraph6Doesglobalwarmingmatter?Positiveeffects（正面影响）Negativeeffects(负面影响）1.causethesealeveltorise2.severestorms3.floods4.droughts5.famines6.thespreadofdiseases7.disappearanceofspeciesPositiveeffectsNegativeeffectsThesealeveltorise.Severestormsdroughtsfaminesthespreadofdiseasesdisappearanceofspecies1.causethesealeveltorise2.severestorms3.floods4.droughts5.famines6.thespreadofdiseases7.disappearanceofspeciesPositiveeffectsNegativeeffects1.makeplantsgrowquicker2.cropswillproducemore3.agreaterrangeofanimals4.makelifebetterSummaryHowEffects1.Humanactivities2.GreenhousegasesCarbondioxideHomework1.Readthetextagain,andtrytoretellit.2.Findoutthedifficultsentencesinthepassage.•Itiseveryone’sdutytomakeacontributiontoourenvironment.