北师大版Unit22.Lesson1Global-Warming阅读课件

Lesson1GlobalWarmingEnvironmentalproblems?airpollutionglobalwarmingendangeredanimalswaterpollutionsoilpollutionsandstormforestationnoisepollutiondesertification:Whatdoyouknowaboutglobalwarming?BrainstormingRaisingtheEarth’stemperaturewillcausesubstantialmeltingofthepolaricecapswhichwillthenleadtoariseinthesealevelandsubsequentfloodingoflow-lyingareas.Globalwarmingwillalsochangecountries’climatesandcausehugefoodandwatershortages.Mostenvironmentalistsagreethatglobalwarmingisanunnaturalphenomenoncausedbytheemissionsfromburningcarbonfuelssuchascoal,oilandpetrol;theycallthisthe“greenhouseeffect”.Therehavebeenseveralsummitsofgovernmentstodiscussthisproblembutmanycountriesdon’twanttomakechangestotheirfactoriesandindustrialworksasthiswouldcostthemmoney.Whichcountriesdoyouthinkcontributemoretoglobalwarming?a)developedcountriesb)developingcountriesDevelopedcountries–moreindustryandtechnology.PartIIPre-readingCanwetaketheheat?Guessing:Basedonthetitleandthefollowingpictures,canyouguesswhat’sthemeaningoftheword“take”?Pre-readingQuestion:Whatisglobalwarming?GlobalwarmingmeansanaverageincreaseintheEarth’stemperaturewhichleadstoclimatechange.While-reading:SkimmingReadthetextandfindmainideaofeachparagraph.A.Drawreaders’attentiontothetopicbyaskingquestions.B.Whatshouldhumanbeingsdo.C.Whatisglobalwarming.D.Consequencesofglobalwarming.E.WhatcauseglobalwarmingPara1.Para2.Para3.Para4.Para5.While-reading:Skimmingconsensus,bounce,agriculture,coincidence,condemn,reservation,sacrifice,advocateScanthetextbelowforthesewordsandworkouttheirmeanings.Scanning:Scanthetextbelowforthesewordsandworkouttheirmeanings.consensusbounceagriculturecoincidence•aremarkableconcurrenceofeventsbychance•movequicklyup,back,orawayfromasurfaceafterhitting•ageneralagreement•thescienceorpracticeoffarmingcondemnreservationsacrificeadvocate•theactionofreservingsomething•torecommendorsupportpublicly•togiveup(somethingimportantorvalued)becauseofotherconsiderations•sentencetoaparticularpunishment,especiallydeath1.Whathumanactivitiesarecausingglobalwarming?2.Byhowmuchhastheglobalaveragetemperatureincreasedinthelast100years?3.AregreenhousegasesnecessaryforlifeonEarth?4.Howcanwehelpsolvetheproblemofglobalwarming?Readthetextandanswerthequestions.1)Whathumanactivitiesarecausingglobalwarming?Industry,agriculture,thecuttingdownofforests,theincreaseintransportandtheburningoffuelsarecausingglobalwarming.2)Byhowmuchhastheglobalaveragetemperatureincreasedinthelast10years?By1°F(onedegreeFahrenheit).3)AregreenhousegasesnecessaryforlifeonEarth?Yes,theyare,becausetheytrapheatfromthesunintheEarth’satmosphere.OtherwisetheEarthwouldbecoldandunsuitableforlife.4)Howcanwehelpsolvetheproblemofglobalwarming?Wecanmakesmallchangesliketakingpublictransport,recycling,usinglow-flowshowerheads,andbuyingenergy-efficientlightbulbstohelpstopglobalwarming.Postreading:GroupworkVoiceyouropinions:Whatwillyoudoeverydaytohelpreducegreenhousegases?takepublictransportlikebuses，trainsandsubwaysExamplesTherecyclingsymbolbuytherecycledproductsuselow-flowshowerheadsbuyenergy-efficientlightbulbsPostreading:GroupworkVoiceyouropinions:Whatwillyoudoeverydaytohelpreducegreenhousegases?Post-reading:vocabularyUsetheexpressionsintheboxinthecorrectformtocompletethesentences.1Waterwasthefishpondfromtheriver.2Weallneedtotofinishintime!pumpedintospeedupbeyondourcontrol,pumpinto,asaresultof,inlargequantities,referto,speedup3.Thereisnothingmorewecando.thesituationisnow.4.theaccident,sheisnowafraidofwater.5.Thescientistglobalwarmingatleastthreetimesinhisspeech.6.Thefactorywasproducinggreenhousegases_________________.beyondourcontrolAsaresultofreferredtoinlargequantitiesWriteacompositionabouthowcanwesolvetheproblemofglobalwarming?(120-150words)(Inyouressay,itshouldincludethereasons,theeffectandmeasuresofglobalwarming)Homework: