高中英语选修六unit4-reading

Unit4GlobalWarming,Reading,leadinCanyouthinkofsomenaturaldisasters(自然灾害)becauseoftheextremeheat(酷暑)?,drought(旱灾),fire,TheEarthisBecomingWarmer-ButDoesItMatter?地球在变暖要不要紧？,Reading,Wordsandexpressions,temperature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,Scanning,Who：_Threescientists:_,SophieArmstrong,DrJaniceFoster;,CharlesKeeling;,GeorgeHambley;,Whatarethetwographsabout?,Graph1showsthetemperaturedifference(温度差异)from1860to2000.,Graph2showsthecarbondioxidecontent(二氧化碳含量)intheatmospherefrom1957to1997.,Graph1:,Graph2:,CarefulReading,Paragraph1,Paragraphs2&5,Paragraph6,Mainideaofthetext,Paragraph7,Howglobalwarmingcomesabout?(全球变暖是怎样产生的),Twodifferentopinionsaboutglobalwarming.,Theearthisbecomingwarmer.,Shouldwedoanything?,Duringthe20thcentury,thetemperatureoftheearthdidntseemtoincreasemuch.2.Thereisnodoubtthatglobalwarmingiscausedbythehumanactivities.3.Notallscientistsbelievethattheincreaseintheearthstemperatureisduetotheburningoffossilfuels.,Trueorfalse,4.Thelevelsofcarbondioxidehaveincreasedgreatlyoverthelast100150years.5.GeorgeHambleybelievesthatglobalwarmingwilldogoodtotheearth.6.Weknowtheeffectsofglobalwarming.,Howhasglobalwarmingcomeabout(产生)?,1.Humanactivity,Theproblembeginswhenhugequantitiesofextracarbondioxide(大量的二氧化碳)areaddedintotheatmosphere.,isduetotheburningoffossilfuels,2.Greenhousegases,Paragraph2&3,FossilFuel(矿物燃料),coal,oil,gas,produce,二氧化碳,Haveyoueverseenagreenhouse?,Methanemi:ein,WhatareGreenhousegases?,Therearegasescalled“greenhousegases”,including,Carbondioxide,Watervapour,Theytraptheheatfromthesunandwarmtheearth.,Para4.thelevelsofcarbondioxidehaveincreasedgreatlyoverthelast100to150years,Whomadeaccuratemeasurementsoftheamountofcarbondioxide?2.Howmuchhasincreased?,CharlesKeeling,Thecarbondioxideintheatmospherewentupfromaround315partstoaround370partspermillion.,Para5.Howhighwillthetemperaturego?,Theamountofwarmingcouldbeaslowas1to1.5degreesCelsius,butitcouldbeashighas5degrees.,Dr.Foster:_GeorgeHambley:_,Whatdothescientiststhinkaboutglobalwarming?Dotheyagreewithoneanother?,Itwouldbeacatastrophe.,weshouldnotworryaboutit.,Theyhavequitedifferentattitudestowardsthisissue.,Paragraph6,Doesglobalwarmingmatter?,Positiveeffects（正面影响）,Negativeeffects(负面影响）,causethesealeveltoriseseverestormsfloodsdroughtsfaminesthespreadofdiseasesdisappearanceofspecies,Positiveeffects,Negativeeffects,Thesealeveltorise.,Severestorms,droughts,famines,thespreadofdiseases,disappearanceofspecies,causethesealeveltoriseseverestormsfloodsdroughtsfaminesthespreadofdiseasesdisappearanceofspecies,Positiveeffects,Negativeeffects,makeplantsgrowquickercropswillproducemoreagreaterrangeofanimalsmakelifebetter,Summary,How,Effects,1.Humanactivities,2.Greenhousegases,Carbondioxi