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1、全球气候变暖英语演讲稿 全球变暖英语演讲稿globalwarming,thegradualincreaseofthetemperatureoftheearth'sloweratmosphereasaresultoftheincreaseingreenhousegasessincetheIndustrialRevolution.Thetemperatureoftheatmosphereneartheearth'ssurfaceiswarmedthroughanaturalprocesscalledthegreenhouseeffect.Visible,shortwav
2、elightesfromthesuntotheearth,passingunimpededthroughablanketofthermal,orgreenhouse,gasesposedlargelyofwatervapor,carbondioxide,methane,nitrousoxide,andozone.Infraredradiationreflectsoffthepla'ssurfacetowardspacebutdoesnoteasilypassthroughthethermalblanket.Someofitistrappedandreflecteddo
3、wnward,keepingtheplaatanaveragetemperaturesuitabletolife,about60°F(16°C).全球变暖英语演讲稿Growthinindustry,agriculture,andtransportationsincetheIndustrialRevolutionhasproducedadditionalquantitiesofthenaturalgreenhousegasespluschlorofluorocarbonsandothergases,augmentingthethermalblanket.Itisgene
4、rallyaeptedthatthisincreaseinthequantityofgreenhousegasesistrappingmoreheatandincreasingglobaltemperatures,makingaprocessthathasbeenbeneficialtolifepotentiallydisruptiveandharmful.Duringthepastcentury,theatmospherictemperaturehasrisen1.1°F(0.6°C),andsealevelhasrisenseveralinches.Somepro
5、jected,longer-termresultsofglobalwarmingincludemeltingofpolarice,witharesultingriseinsealevelandcoastalflooding;disruptionofdrinkingwatersuppliesdependentonsnowmelts;profoundchangesinagricultureduetoclimatechange;extinctionofspeciesasecologicalnichesdisappear;morefrequenttropicalstorms;
6、andanincreasedincidenceoftropicaldiseases.Amongfactorsthatmaybecontributingtoglobalwarmingaretheburningofcoalandpetroleumproducts(sourcesofcarbondioxide,methane,nitrousoxide,ozone);deforestation,whichincreasestheamountofcarbondioxideintheatmosphere;methanegasreleasedinanimalwaste;andinc
7、reasedcattleproduction,whichcontributestodeforestation,methaneproduction,anduseoffossilfuels.Muchofthedebatesurroundingglobalwarminghascenteredontheauracyofscientificpredictionsconcerningfuturewarming.Topredictglobalclimatictrends,climatologistsaumulatelargehistoricaldatabasesa
