高中英语选修六unit4-reading课件

Unit4GlobalWarmingReadingUnit4GlobalWarmingReading1

leadinCanyouthinkofsomenaturaldisasters(自然灾害)becauseoftheextremeheat(酷暑)?leadin2drought(旱灾)drought(旱灾)3firefire4TheEarthisBecomingWarmer--ButDoesItMatter?地球在变暖——要不要紧？ReadingTheEarthisBecomingWarmerRe5Wordsandexpressionstemperature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Wordsandexpressionstempera6

ScanningWho

：_____________Threescientists:____________________________

SophieArmstrongDrJaniceFoster;CharlesKeeling;GeorgeHambley;ScanningWho：_________7Whatarethetwographsabout?Graph1showsthetemperaturedifference(温度差异)from1860to2000.Graph2showsthecarbondioxidecontent(二氧化碳含量)intheatmospherefrom1957to1997.Graph1:Graph2:Whatarethetwographsabout?8CarefulReadingCarefulReading9Paragraph1Paragraphs2&5Paragraph6Part1Part2Part4MainideaofthetextPart3Paragraph7Howglobalwarmingcomesabout?(全球变暖是怎样产生的)Twodifferentopinionsaboutglobalwarming.Theearthisbecomingwarmer.Shouldwedoanything?Paragraph1Paragraphs2&5Parag10Duringthe20thcentury,thetemperatureoftheearthdidn’tseemtoincreasemuch.2.Thereisnodoubtthatglobalwarmingiscausedbythehumanactivities.3.Notallscientistsbelievethattheincreaseintheearth’stemperatureisduetotheburningoffossilfuels.Trueorfalse

Duringthe20thcentury,the114.Thelevelsofcarbondioxidehaveincreasedgreatlyoverthelast100—150years.5.GeorgeHambleybelievesthatglobalwarmingwilldogoodtotheearth.6.Weknowtheeffectsofglobalwarming.4.Thelevelsofcarbondioxid12Howhasglobalwarmingcomeabout(产生)?1.Humanactivity

Theproblembeginswhenhugequantitiesofextracarbondioxide(大量的二氧化碳)areaddedintotheatmosphere.…isduetotheburningoffossilfuels…2.

GreenhousegasesParagraph2&3Howhasglobalwarmingcomeab13carbondioxideFossilFuel(矿物燃料)coaloilgasglobalwarming●●●●●●produce二氧化碳carbondioxideFossilFuel(矿物燃料14Haveyoueverseenagreenhouse?Haveyoueverseenagreenhous15Methane['mi:θein]

WhatareGreenhousegases?Therearegasescalled“greenhousegases”,including…CarbondioxideWatervapourTheytraptheheatfromthesunandwarmtheearth.Methane['mi:θein]WhatareGre16Para4.thelevelsofcarbondioxidehaveincreasedgreatlyoverthelast100to150yearsWhomadeaccuratemeasurementsoftheamountofcarbondioxide?2.Howmuchhasincreased?CharlesKeelingThecarbondioxideintheatmospherewentupfromaround315partstoaround370partspermillion.Para4.thelevelsofcarbond17Para5.Howhighwillthetemperaturego?Theamountofwarmingcouldbeaslowas1to1.5degreesCelsius,butitcouldbeashighas5degrees.Para5.Howhighwillthetemp18Dr.Foster:_____________________GeorgeHambley:_________________Whatdothescientiststhinkaboutglobalwarming?Dotheyagreewithoneanother?Itwouldbeacatastrophe.weshouldnotworryaboutit.Theyhavequitedifferentattitudestowardsthisissue.Paragraph6Dr.Foster:____________________19Doesglobalwarmingmatter?Positiveeffects（正面影响）

Negativeeffects(负面影响）Doesglobalwarmingmatter?Pos20causethesealeveltoriseseverestormsfloodsdroughtsfaminesthespreadofdiseasesdisappearanceofspeciesPositiveeffectsNegativeeffectscausethesealeveltorisePos21Thesealeveltorise.Thesealeveltorise.22SeverestormsdroughtsfaminesthespreadofdiseasesSeverestormsdroughtsfaminesth23disappearanceofspeciesdisappearanceofspecies24causethesealeveltoriseseverestormsfloodsdroughtsfaminesthespreadofdiseasesdisappearanceofspeciesPositiveeffectsNegativeeffectsmakeplantsgrowquickercropswillproducemoreagreaterrangeofanimalsmakelifebettercausethesealeveltorisePos25Summary

HowEffects

SummaryHowEffects261.Humanactivities2.GreenhousegasesCarbondioxide1.Humanactivities2.Greenhous27Homework1.Readthetextagain,and