Unit 4 Global warming Reading 课件-高中英语人教版选修六

WhatHowWhyUnit4GlobalWarming

Theearthisbecomingwarmer--butdoesitmatter?Fromamagazine:EarthCareAlead-inparagraphtoleadintothetopicandgiveanoverview

pictures/graphs/quotesDrJaniceFosterexplains:“...”Shesays,“...”Hambleystates,“...”Tip:Wecanoftengetthemainideaofamagazinearticlebyglancingatthetitle,thelead-inparagraph,andthegraphs/pictures/quotes.SophieArmstrongtosupporttheideabyprovidingsolidevidencesoastomakethearticlemorescientificandconvincingTheearthisbecomingwarmer./GlobalwarmingHowhasthiscomeabout?Doesitmatter?Topic/PhenomenonCausesEffectsSolutionsTitle+Alead-inparagraphtoleadintothetopicandgiveanoverview

Unit4GlobalWarmingAttitudes

F1F≈______C。。0.6Itprobablydoesnotseemmuchtoyouorme,butitisarapidincreasewhencomparedtoothernaturalchanges.Topic/PhenomenonTheearthisbecomingwarmer./GlobalwarmingStatement+AgraphDuringthe20thcenturythetemperatureoftheearthroseaboutonedegreeFahrenheit.40years55ppm↑

20years40ppm↑

CausesWentupfromaround315ppmtoaround370ppmconcentrationWhomadetheaccuratemeasurements?amountItwasCharlesKeelingwho…315370Para.2-5(1)Why?What’sthephenomenon?(2)WhatroledoesCO2playinthephenomenon?(3)WherearequantitiesofextraCO2from?(4)Whatistoblameforglobalwarming?(5)WhyisCO2

amountincreasingsoquickly?Thetemperatureincreasedependsontheriseofcarbondioxideamount.?anaturalphenomenongreenhousegasestrapheatfromthesuntowarm

theearthWeneednecessaryamountofgreenhousegasesandnaturalgreenhouseeffecttowarmtheearth,withoutwhichtheearthwouldbeabout33Ccooler.Thereisnodoubtthatitis

humanthat

istoblameforglobalwarming.。Theburningof

fossilfuelstoproduceenergyaddsquantitiesofextra

CO2sothatmoreheattendstobetrapped,causingtheglobaltemperaturetogoup.1-1.5

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5

NegativePositiveplantsgrowquickercropsproducemoreagreaterrangeofanimalsontheonehand(DrFoster)ontheotherhand(GeorgeHambley)leadtoacatastrophebemildwithfewbadconsequencesandmakelifebetterPara.6-7ariseinthesealevelstorms,floods,droughts,faminesthespreadofdiseasesthedisappearanceofspecies▲▲▲▲▲▲▲Scientists’attitudesDoesitmatter?Effects/Attitudes/SolutionsPara.7Greenhousegasescontinuetobuildupintheatmosphere.Evenifwestartreducingtheamountofgreenhousegases,theclimateisgoingtokeeponwarmingfordecadesorcenturies.Nooneknowstheeffectsofglobalwarming.Doesthatmeanweshoulddonothing?Or,aretheriskstoogreat?Theearthisbecomingwarmer--butdoesitmatter?Solutions?Toencouragereaders'reflectionProblem?Theauthorexploresthetopicofglobalwarmingobjectivelywithaclearstructureandsolidevidencelikegraphs,data,andquotesofscientistssoastodeepenreaders’

understandingandencouragereaders’reflectionaboutglobalwarmingandwhetherweshoulddosomething.DonothingVS.Dosomething?Althoughwecan’treallyknowtheeffectsofglobalwarming,whenfacedwiththepossiblegreatrisks,it'sbettertodothannever.Wecan’ttakeariskofruiningourchildren’sfuture.Thekeyisto___________________TurnelectricalappliancesoffwhentheyarenotinuseSaveenergy----addlessCO2Driveless;walkorridebikesmoreRecyclesomematerial(imporvewastesorting)BuythingsthatareeconomicalwithenergyPlanttrees----absorbmoreCO2?Whatcanwedoaboutglobalwarming?reducetheamountofCO2Reuse,recycleandreduce.Beaneducator.

Asaneducator,nowyouwanttowriteaproposalonbehalfof

theStudents’Unionaboutwhatwestudentscandoaboutglobalwarming.Dearfellowstudents,Asweknow,(fact+cause+possibleeffect).Nowonbehalfof...,Iappealtoyouto.../Isuggestt