高中英语选修六unit4-reading-pp课件

Unit4GlobalWarmingReading1ppt课件Unit4GlobalWarmingReading1

leadinCanyouthinkofsomenaturaldisasters(自然灾害)becauseoftheextremeheat(酷暑)?2ppt课件leadin2ppt课件drought(旱灾)3ppt课件drought(旱灾)3ppt课件fire4ppt课件fire4ppt课件TheEarthisBecomingWarmer--ButDoesItMatter?地球在变暖——要不要紧？Reading5ppt课件TheEarthisBecomingWarmerReWordsandexpressionstemperature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6ppt课件Wordsandexpressionstempera

ScanningWho

：_____________Threescientists:____________________________

SophieArmstrongDrJaniceFoster;CharlesKeeling;GeorgeHambley;7ppt课件ScanningWho：_________Whatarethetwographsabout?Graph1showsthetemperaturedifference(温度差异)from1860to2000.Graph2showsthecarbondioxidecontent(二氧化碳含量)intheatmospherefrom1957to1997.Graph1:Graph2:8ppt课件Whatarethetwographsabout?CarefulReading9ppt课件CarefulReading9ppt课件Paragraph1Paragraphs2&5Paragraph6Part1Part2Part4MainideaofthetextPart3Paragraph7Howglobalwarmingcomesabout?(全球变暖是怎样产生的)Twodifferentopinionsaboutglobalwarming.Theearthisbecomingwarmer.Shouldwedoanything?10ppt课件Paragraph1Paragraphs2&5ParagDuringthe20thcentury,thetemperatureoftheearthdidn’tseemtoincreasemuch.2.Thereisnodoubtthatglobalwarmingiscausedbythehumanactivities.3.Notallscientistsbelievethattheincreaseintheearth’stemperatureisduetotheburningoffossilfuels.Trueorfalse

11ppt课件Duringthe20thcentury,the4.Thelevelsofcarbondioxidehaveincreasedgreatlyoverthelast100—150years.5.GeorgeHambleybelievesthatglobalwarmingwilldogoodtotheearth.6.Weknowtheeffectsofglobalwarming.12ppt课件4.ThelevelsofcarbondioxidHowhasglobalwarmingcomeabout(产生)?1.Humanactivity

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

GreenhousegasesParagraph2&313ppt课件HowhasglobalwarmingcomeabcarbondioxideFossilFuel(矿物燃料)coaloilgasglobalwarming●●●●●●produce二氧化碳14ppt课件carbondioxideFossilFuel(矿物燃料Haveyoueverseenagreenhouse?15ppt课件HaveyoueverseenagreenhousMethane['mi:θein]

WhatareGreenhousegases?Therearegasescalled“greenhousegases”,including…CarbondioxideWatervapourTheytraptheheatfromthesunandwarmtheearth.16ppt课件Methane['mi:θein]WhatareGrePara4.thelevelsofcarbondioxidehaveincreasedgreatlyoverthelast100to150yearsWhomadeaccuratemeasurementsoftheamountofcarbondioxide?2.Howmuchhasincreased?CharlesKeelingThecarbondioxideintheatmospherewentupfromaround315partstoaround370partspermillion.17ppt课件Para4.thelevelsofcarbondPara5.Howhighwillthetemperaturego?Theamountofwarmingcouldbeaslowas1to1.5degreesCelsius,butitcouldbeashighas5degrees.18ppt课件Para5.HowhighwillthetempDr.Foster:_____________________GeorgeHambley:_________________Whatdothescientiststhinkaboutglobalwarming?Dotheyagreewithoneanother?Itwouldbeacatastrophe.weshouldnotworryaboutit.Theyhavequitedifferentattitudestowardsthisissue.Paragraph619ppt课件Dr.Foster:____________________Doesglobalwarmingmatter?Positiveeffects（正面影响）

Negativeeffects(负面影响）20ppt课件Doesglobalwarmingmatter?PoscausethesealeveltoriseseverestormsfloodsdroughtsfaminesthespreadofdiseasesdisappearanceofspeciesPositiveeffectsNegativeeffects21ppt课件causethesealeveltorisePosThesealeveltorise.22ppt课件Thesealeveltorise.22ppt课件Severestormsdroughtsfaminesthespreadofdiseases23ppt课件Severestormsdroughtsfaminesthdisappearanceofspecies24ppt课件disappearanceofspecies24ppt课causethesealeveltoriseseverestormsfloodsdroughtsfaminesthespreadofdiseasesdisappearanceofspeciesPositiveeffectsNegativeeffectsmakeplantsgrowquickercropswillproducemoreagreaterrangeofanimalsmakelifebetter25ppt课件causethesealeveltorisePosSummary

HowEffects

26ppt课件SummaryHowEffects26ppt课件1.Humanactivities2.GreenhousegasesCarbondioxide27ppt课件1.Humanactivities2.GreenhousHomework1.Readthetextagain,andtryto