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1、LESSON1GLOBALWARMING11GlobalWarmingIngroupsdiscusswhatyouknowaboutglobalwarming.Lookatthepicturestogetideas.2TrafficJam3Factory4ThegreenhouseeffectistheriseintemperaturethattheEarthexperiencesbecausecertaingasesintheatmosphere(watervapor,carbondioxide,nitrousoxide,an
2、dmethane,forexample)trapenergyfromthesun.Withoutthesegases,heatwouldescapebackintospaceandEarth’saveragetemperaturewouldbeabout60ºFcolder.Becauseofhowtheywarmourworld,thesegasesarereferredtoasgreenhousegases.TheGreenhouseEffect5TheGreenhouseEffect6Withoutthisgreenhou
3、seheating,theEarth'saveragetemperaturewouldbeonlyabout-73C(-100F);eventheoceanswouldbefrozenundersuchconditions,suchastheMoonandtheMars.MarsMoon7WhatAreGreenhouseGases?Somegreenhousegasesoccurnaturallyintheatmosphere,whileothersresultfromhumanactivities.Naturallyoccu
4、ringgreenhousegasesincludewatervapor,carbondioxide,methane,nitrousoxide,andozone.Certainhumanactivities,however,addtothelevelsofmostofthesenaturallyoccurringgases.8Owingtotheriseinatmosphericcarbondioxidecausedbymodernindustrialsocieties'widespreadcombustionoffossilf
5、uels(coal,oil,andnaturalgas),thegreenhouseeffectonEarthmaybeintensifiedandlong-termclimaticchangesmayresult.9Whenfacedwiththisquestion,asindividualsshouldrecognizethatcollectivelywecanmakeadifference.Whatdifferencecanwemake?Individual10Takingactiononglobalwarming(orc
6、limatechange)issimilar.Insomecases,itonlytakesalittlechangeinlifestyleandbehaviortomakesomebigchangesingreenhousegasreductions.Forothertypesofactions,thechangesaremoresignificant.Whenthatactionismultipliedbythe1.3billionpeopleintheChina.Orthe6billionpeopleworldwide,t
7、hesavingsaresignificant.11Takingpublictransportlikebusescanreducegreenhousegasemissions12AndTakingtraincanalsohelpareductionofgreenhousegas.13TherecyclingsymbolBuytherecycledproductsRecycledproducts14RecyclingthebottlesYourglassbottlescouldberecycledintohouseinsulati
8、on,plasticbottlescouldbemadeintoacosyfleecejacket.15Paperrecyclingyourpapercouldbecomepartofaroadorrace-track16usinglow-flowshowerh
