人教版高二英语选修六Unit 4 Global warming reading PPT 课件.ppt

人教课标版高二选修6Unit4,英语课件,Reading,Whatisthegreenhousemadeandusedfor?,Agreenhouseismadeofglassandisusedforgrowingplants,especiallyduringcoldweather.,Howdoesitwork?Theairinsideiswarmbecausetheglasstrapstheheatfromthesunandkeepsitfromescaping.Thismakesthegreenhouseheatupandsotheplantscangrowthroughoutthecoldperiod.,Whatarethe“greenhousegases”?Intheatmospheresurroundingtheearththerearegases,whicharecalled“greenhousegases”,includingcarbondioxide,methane(甲烷,沼气)andwatervapor.,Whatdoyouthinkgreenhousegasesdo?Theytrapheatfromthesunandthereforewarmtheearth.,(Paragraph1),Introduceadebateovertheissueofglobalwarming.,Raisingaquestion,Skimming,(Paragraphs2-3),Illustratehowglobalwarmingcomesabout.,Givingexamples,usinggraphs,explanation.,(Paragraphs4-5),Listtwodifferentattitudesamongscientiststowardsglobalwarming.,Givingexamples,makingcontrast.,(Paragraph6),Itsuptoreaderstothinkanddecidewhetherpeopleshoulddosomethingaboutglobalwarmingornot.,Usingaquestion,leavingreaderstothinkovertheissue.,Readthetextcarefullyandfillintheblanks.,gases,quantitiesof,globaltemperature,catastrophe,highlevels,consequences,States,positive,Choosethebestanswersaccordingtothetext.1.WhichofthefollowingisTRUEaccordingtothetext?A.ThetemperatureoftheearthincreasedaboutonedegreeFahrenheitduringthe20thcentury.B.Thecarbondioxidecontentintheairincreasedby70partspermillionfrom1957to1997.C.Allscientistsacceptthedataingraph2exceptCharlesKeeling.D.JaniceFostersaysthatmorecarbondioxidewillmakeplantsgrowfaster.,A,2.WhichofthefollowingisDrJaniceFostersopinion?A.Theresultofthetemperatureincreasewillbeserious.B.Theamountofwarmingisnothingserious.C.Weneedntworryabouthighlevelsofcarbondioxide.D.Globalwarmingisanaturalphenomenon.,A,浓度单位,Answerthequestions.Whowrotethemagazinearticle?Whatisthenameofthemagazine?SophieArmstrongwrotethemagazinearticle.ThenameofthemagazineisEarthCare.,Postreading,2.Whatarethenamesofthethreescientistsmentionedinthearticle?TheyareDr.JaniceFoster,CharlesKeelingandGeorgeHambley.,3.Whatdotheythinkaboutglobalwarming?Dotheyagreewithoneanother?Theydontagreewitheachother.Dr.JaniceFosterthinkstheeffectsofglobalwarmingcouldbeveryserious.,GeorgeHambleythinksglobalwarmingwillbemildwithfewbadenvironmentalconsequences.CharlesKeelingbelievesitistheburningofmoreandmorefossilfuelsthatisresultinginabigincreaseincarbondioxide.,4.Whatarethetwographsabout?GraphIshowsthetemperatureincreaseofonedegreeFahrenheitbetween1860to2000.Graph2isaboutthecarbondioxidecontentintheatmosphere,1958-1990.,5.Whatisthemaintopicofthearticle?Globalwarming/thewarmingoftheearth.,2.Checkthestatementsonpage27True:3,5,6,7,8False:1,2,4,9,10Correctsentences:1.Thetemperaturelastcenturyincreasedmuch.2.Noteveryonebelievesthatglobalwarmingiscausedbyhumanactivities.,4.Naturalgasisnotagreenhousegasbutafossilfuel.9.GeorgeHambleythinksthatmorecarbondioxideisapositivethinganditwillmakeplantsgrowfaster.10.Itisunknownwhattheeffectsofglobalwarmingwillbe.,DebateInstructionsGetintogroupsofsix.Decidewhichthreeinyourgrouparegoingtoagreewiththestatement(GroupA)andwhichthreearegoingtodisagreewiththestatement(GroupB).,GroupAdiscusswhytheyagreewiththestatement;GroupBdiscusswhytheydisagree.GroupAandBgettogether.Telleachotherthereasonswhyagreeordisagreewiththestatement.,SupplementarymaterialsfordebatingGlobalwarming1.Theplanethaswarmedanywherefrom0.5to1.0C(1to2F)overthelastcentury.,Thissmallamountmakesahugedifference,causingglacierstomeltand,potentially(潜在的),sealeveltorise.Wecouldseeevenmoreofthisinthefuture,(maybeanother3C,or5F),globalwarming,globalwarming,2.Adefinitionofglobalwarmingwouldhavetoincludeameasurable,consistenttemperaturerise,liketheonewehaveseeninrecenthistory.AquestionremainsIsitanunusualchange?Muchdebateaboutthatone.,3.Theearthgetsonekindofenergy(visiblelight)fromthesunandgivesoffanotherkind(infrared红外线).Thiskindiswhatgetstrappedbygreenhousegases(GHGs)intheatmosphere.,Greenhousegases4.Theglobalwarminggreenhouseeffectreallyisabogus(假的)term.Agreenhousekeepswarmbyphysicallytrappingtheairinsideandpreventingconvection(对流).Theatmospherehelpskeeptheplanetwarmbytrappingoutgoingradiationinstead.,5.TheleadinggassesareCarbon-dioxide,Methane,Ozone(臭氧)andNitrousOxide(一氧化二氮).Gasanalyzersshowtheconcentrationsofthisstuffhaveincreasedsomewhatsincethebeginningoftheindustrialrevolution.,6.ThegreenhouseeffectraisestheaveragetemperatureoftheEarthbymorethan30degrees,sowithoutittheEarthwouldbeaverycoldplace!,greenhouseeffect,greenhouseeffect,GREENHOUSEFeelinghelplesstodoanythingaboutglobalwarming?Findouthowonefamilycut