北师大版Unit22.Lesson1Global Warming阅读课件

Lesson1GlobalWarming,Environmentalproblems?,airpollution,globalwarming,endangeredanimals,waterpollution,soilpollution,sandstorm,forestation,noisepollution,desertification,warm-up,Question:Whatdoyouknowaboutglobalwarming?,Brainstorming,RaisingtheEarthstemperaturewillcausesubstantialmeltingofthepolaricecapswhichwillthenleadtoariseinthesealevelandsubsequentfloodingoflow-lyingareas.,Globalwarmingwillalsochangecountriesclimatesandcausehugefoodandwatershortages.,Mostenvironmentalistsagreethatglobalwarmingisanunnaturalphenomenoncausedbytheemissionsfromburningcarbonfuelssuchascoal,oilandpetrol;theycallthisthe“greenhouseeffect”.,Therehavebeenseveralsummitsofgovernmentstodiscussthisproblembutmanycountriesdontwanttomakechangestotheirfactoriesandindustrialworksasthiswouldcostthemmoney.,Whichcountriesdoyouthinkcontributemoretoglobalwarming?,a)developedcountriesb)developingcountries,Developedcountriesmoreindustryandtechnology.,Canwetaketheheat?,Guessing:Basedonthetitleandthefollowingpictures,canyouguesswhatsthemeaningoftheword“take”?,Pre-reading,Question:Whatisglobalwarming?,GlobalwarmingmeansanaverageincreaseintheEarthstemperaturewhichleadstoclimatechange.,While-reading:Skimming,Readthetextandfindmainideaofeachparagraph.,A.Drawreadersattentiontothetopicbyaskingquestions.B.Whatshouldhumanbeingsdo.C.Whatisglobalwarming.D.Consequencesofglobalwarming.E.Whatcauseglobalwarming,Para1.Para2.Para3.Para4.Para5.,While-reading:Skimming,consensus,bounce,agriculture,coincidence,condemn,reservation,sacrifice,advocate,Scanthetextbelowforthesewordsandworkouttheirmeanings.,Scanning:,Scanthetextbelowforthesewordsandworkouttheirmeanings.,consensusbounceagriculturecoincidence,aremarkableconcurrenceofeventsbychancemovequicklyup,back,orawayfromasurfaceafterhittingageneralagreementthescienceorpracticeoffarming,condemnreservationsacrificeadvocate,theactionofreservingsomethingtorecommendorsupportpubliclytogiveup(somethingimportantorvalued)becauseofotherconsiderationssentencetoaparticularpunishment,especiallydeath,1.Whathumanactivitiesarecausingglobalwarming?2.Byhowmuchhastheglobalaveragetemperatureincreasedinthelast100years?3.AregreenhousegasesnecessaryforlifeonEarth?4.Howcanwehelpsolvetheproblemofglobalwarming?,Readthetextandanswerthequestions.,1)Whathumanactivitiesarecausingglobalwarming?,Industry,agriculture,thecuttingdownofforests,theincreaseintransportandtheburningoffuelsarecausingglobalwarming.,2)Byhowmuchhastheglobalaveragetemperatureincreasedinthelast10years?,By1F(onedegreeFahrenheit).,3)AregreenhousegasesnecessaryforlifeonEarth?,Yes,theyare,becausetheytrapheatfromthesunintheEarthsatmosphere.OtherwisetheEarthwouldbecoldandunsuitableforlife.,4)Howcanwehelpsolvetheproblemofglobalwarming?,Wecanmakesmallchangesliketakingpublictransport,recycling,usinglow-flowshowerheads,andbuyingenergy-efficientlightbulbstohelpstopglobalwarming.,Postreading:Groupwork,Voiceyouropinions:,Whatwillyoudoeverydaytohelpreducegreenhousegases?,takepublictransportlikebuses，trainsandsubways,Examples,Therecyclingsymbol,buytherecycledproducts,uselow-flowshowerheads,buyenergy-efficientlightbulbs,Postreading:Groupwork,Voiceyouropinions:,Whatwillyoudoeverydaytohelpreducegreenhousegases?,Post-reading:vocabulary,Usetheexpressionsintheboxinthecorrectformtocompletethesentences.1Waterwasthefishpondfromtheriver.2Weallneedtotofinishintime!,pumpedinto,speedup,beyondourcontrol,pumpinto,asaresultof,inlargequantities,referto,speedup,3.Thereisnothingmorewecando.thesituationisnow.4.theaccident,sheisnowafraidofwater.5.Thescientistglobalwarmingatleastthreetimesinhisspeech.6.Thefactorywasproducinggreenhousegases_.,beyondourcontrol,Asaresultof,referredto,inlargequantities,Writea