全球气候变暖unit1globalwarming

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1、Unit1GlobalWarmingWhatarethecausesofglobalwarming?TrafficJamFactoryThegreenhouseeffectistheriseintemperaturethattheEarthexperiencesbecausecertaingasesintheatmosphere(watervapor(水蒸汽),carbondioxide,nitrousoxide(一氧化二氮),andmethane(甲烷),forexample)trapenergyfr

2、omthesun.Withoutthesegases,heatwouldescapebackintospaceandEarth’saveragetemperaturewouldbeabout60ºFcolder.Becauseofhowtheywarmourworld,thesegasesarereferredtoasgreenhousegases.TheGreenhouseEffectTheGreenhouseEffectSomegreenhousegasesoccurnaturallyintheat

3、mosphere,whileothersresultfromhumanactivities.Naturallyoccurringgreenhousegasesincludewatervapor,carbondioxide,methane(甲烷),nitrousoxide(一氧化二氮),andozone(臭氧).Certainhumanactivities,however,addtothelevelsofmostofthesenaturallyoccurringgases.WhatAreGreenhous

4、eGases?Owingtotheriseinatmosphericcarbondioxidecausedbymodernindustrialsocieties‘widespreadcombustion(燃烧)offossilfuels(coal,oil,andnaturalgas),thegreenhouseeffectonEarthmaybeintensifiedandlong-termclimaticchangesmayresult.LondonUSAWhichcountriesdoyouthin

5、kcontributemoretoglobalwarming?SouthAfricaWhatwillyoudoeverydaytohelpreducegreenhousegases?TakingpublictransportlikebusescanreducegreenhousegasemissionsAndTakingtraincanalsohelpareductionofgreenhousegas.TherecyclingsymbolBuytherecycledproductsRecycledpro

6、ductsRecyclingthebottlesYourglassbottlescouldberecycledintohouseinsulation,plasticbottlescouldbemadeintoacozyfleecejacket.Paperrecyclingyourpapercouldbecomepartofaroadorrace-trackusinglow-flowshowerheadsbuyingenergy-efficientlightbulbsreplacewithTheclima

7、tecongressinCopenhagenfilmThankyouforyourlistening!