高中英语Unit 22 Lesson 1 Global Warming课件1 北师大版 选修8 课件VIP免费

11LESSON1GLOBALWARMINGLESSON1GLOBALWARMING1GlobalWarming1GlobalWarmingIngroupsdiscussIngroupsdiscusswhatyouknowaboutwhatyouknowaboutglobalwarming.globalwarming.LookatthepicturesLookatthepicturestogetideas.togetideas.TrafficJamTrafficJamFactoryFactory5ThegreenhouseeffectistheriseinThegreenhouseeffectistheriseintemperaturethattheEarthexperiencestemperaturethattheEarthexperiencesbecausecertaingasesintheatmospherebecausecertaingasesintheatmosphere(watervapor,carbondioxide,nitrousoxide,(watervapor,carbondioxide,nitrousoxide,andmethane,forexample)trapenergyfromandmethane,forexample)trapenergyfromthesun.Withoutthesegases,heatwouldthesun.Withoutthesegases,heatwouldescapebackintospaceandEarth’saverageescapebackintospaceandEarth’saveragetemperaturewouldbeabout60ºFcolder.temperaturewouldbeabout60ºFcolder.Becauseofhowtheywarmourworld,theseBecauseofhowtheywarmourworld,thesegasesarereferredtoasgreenhousegases.gasesarereferredtoasgreenhousegases.TheGreenhouseEffectTheGreenhouseEffectTheGreenhouseEffectTheGreenhouseEffect7Withoutthisgreenhouseheating,theEarth'sWithoutthisgreenhouseheating,theEarth'saveragetemperaturewouldbeonlyabout-73Caveragetemperaturewouldbeonlyabout-73C(-100F);eventheoceanswouldbefrozenunder(-100F);eventheoceanswouldbefrozenundersuchconditions,suchastheMoonandtheMars.suchconditions,suchastheMoonandtheMars.MarsMarsMoonMoon8WhatAreGreenhouseGases?WhatAreGreenhouseGases?SomegreenhousegasesoccurnaturallyinSomegreenhousegasesoccurnaturallyintheatmosphere,whileothersresultfromtheatmosphere,whileothersresultfromhumanactivities.Naturallyoccuringhumanactivities.Naturallyoccuringgreenhousegasesincludewatervapor,greenhousegasesincludewatervapor,carbondioxide,methane,nitrousoxide,andcarbondioxide,methane,nitrousoxide,andozone.Certainhumanactivities,however,ozone.Certainhumanactivities,however,addtothelevelsofmostofthesenaturallyaddtothelevelsofmostofthesenaturallyoccurringgases.occurringgases.9OwingtotheriseinatmosphericcarbonOwingtotheriseinatmosphericcarbondioxidecausedbymodernindustrialsocieties'dioxidecausedbymodernindustrialsocieties'widespreadcombustionoffossilfuels(coal,widespreadcombustionoffossilfuels(coal,oil,andnaturalgas),thegreenhouseeffectonoil,andnaturalgas),thegreenhouseeffectonEarthmaybeintensifiedandlong-termEarthmaybeintensifiedandlong-termclimaticchangesmayresult.climaticchangesmayresult.Whenfacedwiththisquestion,asindividualsshouldrecognizethatcollectivelywecanmakeadifference.Whatdifferencecanwemake?IndividualTakingactiononTakingactiononglobalwarmingglobalwarming(orclimate(orclimatechange)issimilar.Insomecases,itonlytakesachange)issimilar.Insomecases,itonlytakesalittlechangeinlifestyleandbehaviortomakelittlechangeinlifestyleandbehaviortomakesomebigchangesinsomebigchangesingreenhousegasreductionsgreenhousegasreductions..Forothertypesofactions,thechangesaremoreForothertypesofactions,thechangesaremoresignificantsignificant.Whenthatactionismultipliedbythe.Whenthatactionismultipliedbythe1.3billionpeopleintheChina.Orthe6billion1.3billionpeopleintheChina.Orthe6billionpeopleworldwide,thesavingsarepeopleworldwide,thesavingsaresignificant.significant.TakingpublictransportlikebusesTakingpublictransportlikebusescanreducegreenhousegasemissionscanreducegreenhousegasemissionsAndTakingtraincanalsohelpareductionAndTakingtraincanalsohelpareductionofgreenhousegas.ofgreen...