高中英语 Unit22(Lesson1)课件 北师大版选修8 课件VIP免费

Lesson1GlobalWarmingLesson1GlobalWarmingAppreciationofafilmtrailerWordspreviewconsensusbeyondclaimrelevantraybouncepinn.一致的意见prep.超出vt.声称adj.有关的n.光线vi.反弹vt.固定agriculturecoincidencecondemndroughtfederalreservationsacrificeWordspreviewn.农业n.巧合vt.宣判死刑,注定毁灭n.旱灾adj.联邦的n.保留,存疑vt.,vi.牺牲,献出advocaterecyclesubstitutethreatenpancakehurricaneWordspreviewvt.主张,提倡vt.回收利用n.代替品,代用品vt.威胁n.薄煎饼n.飓风Expressionspreviewbeyondone’scontrollookaheadrefertointurnleadtotakeactionaheadof超出……的控制，不受……的控制展望未来指,意即依次引起,导致采取行动在……前面Lookatthepicturesandwhatdoyouknowaboutglobalwarming.ThegreenhouseeffectistheriseintemperaturethattheEarthexperiencesbecausecertaingasesintheatmosphere(watervapor,carbondioxide,nitrousoxide,andmethane,forexample)trapenergyfromthesun.Withoutthesegases,heatwouldescapebackintospaceandEarth’saveragetemperaturewouldbeabout60ºFcolder.Becauseofhowtheywarmourworld,thesegasesarereferredtoasgreenhousegases.Withoutthisgreenhouseheating,theEarth'saveragetemperaturewouldbeonlyabout-73C(-100F);eventheoceanswouldbefrozenundersuchconditions,suchastheMoonandtheMars.MarsMarsMoonMoonSomegreenhousegasesoccurnaturallyintheatmosphere,whileothersresultfromhumanactivities.Naturallyoccurringgreenhousegasesincludewatervapor,carbondioxide,methane,nitrousoxide,andozone.Certainhumanactivities,however,addtothelevelsofmostofthesenaturallyoccurringgases.Owingtotheriseinatmosphericcarbondioxidecausedbymodernindustrialsocieties'widespreadcombustionoffossilfuels(coal,oil,andnaturalgas),thegreenhouseeffectonEarthmaybeintensifiedandlong-termclimaticchangesmayresult.Whichcountriesdoyouthinkcontributemoretoglobalwarning?a)developedcountriesb)developingcountriesmoreindustryandtechnologyWhateffectwillglobalwarminghaveontheseaandthelivingthingsinthesea?Whateffectwillglobalwarminghaveontheseaandthelivingthingsinthesea?Whatwillhappenwithglobalwarming?WillglobalwarmingaffectthelifeofNorthPolarBear?Whatwillhappentopenguinsbecauseofglobalwarming?Readthetextandanswerthesequestions.1)Whatisglobalwarming?GlobalwarmingreferstoanaverageincreaseintheEarth’stemperaturethat,inturn,leadstoclimatechange.2)Whathumanactivitiesarecausingglobalwarming?Industry,agriculture,thecuttingdownofforests,theincreaseintransportandtheburningoffuelsarecausingglobalwarming.3)Byhowmuchhastheglobalaveragetemperatureincreasedinthelast100years?By1ºF(OnedegreeFahrenheit)4)AregreenhousegasesnecessaryforlifeonEarth?Yes,theyare.BecausetheytrapheatfromthesunintheEarth’satmosphere.OtherwisetheEarthwouldbecoldandunsuitableforlife.5)Howcanwehelpsolvetheproblemofglobalwarming?Wecanmakesmallchangesliketakingpublictransport,recycling,usinglow-flowshowerheads,buyinglightbulbsthatuselessenergy,usingrecycledpaperandswitchingoffthelightswhenweleavearoom.6)Whatarethewould-beconsequencesofglobalwarming?Itwillcausemorefrequentflooding,heatwavesanddroughts.Andseriousdiseaseswillspreadandindustriesthatrelyonnaturesuchasfishingwillbebadlyaffected.Itwillcausethepolaricetomelt,raisingsealevels,andfloodingmanyislandsandcities.Insomecases,itonlytakesalittlechangeinlifestyleandbehaviortomakesomebigchangesingreenhousegasreductions.Forothertypesofactions,thechangesaremoresignificant.Whenthatactionismultipliedbythe1.3billionpeopleinChinaorthe6billionpeopleworldwide,thesavingsare...