全球气候变暖unit1GlobalWarming.ppt

Unit1 GlobalWarming Whatarethecausesofglobalwarming TrafficJam Factory ThegreenhouseeffectistheriseintemperaturethattheEarthexperiencesbecausecertaingasesintheatmosphere watervapor 水蒸汽 carbondioxide nitrousoxide 一氧化二氮 andmethane 甲烷 forexample trapenergyfromthesun Withoutthesegases heatwouldescapebackintospaceandEarth saveragetemperaturewouldbeabout60 Fcolder Becauseofhowtheywarmourworld thesegasesarereferredtoasgreenhousegases TheGreenhouseEffect TheGreenhouseEffect Somegreenhousegasesoccurnaturallyintheatmosphere whileothersresultfromhumanactivities Naturallyoccurringgreenhousegasesincludewatervapor carbondioxide methane 甲烷 nitrousoxide 一氧化二氮 andozone 臭氧 Certainhumanactivities however addtothelevelsofmostofthesenaturallyoccurringgases WhatAreGreenhouseGases Owingtotheriseinatmosphericcarbondioxidecausedbymodernindustrialsocieties widespreadcombustion 燃烧 offossilfuels coal oil andnaturalgas thegreenhouseeffectonEarthmaybeintensifiedandlong termclimaticchangesmayresult London USA Whichcountriesdoyouthinkcontributemoretoglobalwarming SouthAfrica Whatwillyoudoeverydaytohelpreducegreenhousegases Takingpublictransportlikebusescanreducegreenhousegasemissions AndTakingtraincanalsohelpareductionofgreenhousegas Therecyclingsymbol Buytherecycledproducts Recycledproducts Recyclingthebottles Yourglassbottlescouldberecycledintohouseinsulation plasticbottlescouldbemadeintoacozyfleecejacket Paperrecycling yourpapercouldbecomepartofaroadorrace track usinglow flowshowerheads buyingenergy efficientlightbulbs replace with TheclimatecongressinCopenhagen film Thankyouforyourlistening