大学英语温室效应.ppt

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1、Greenhouse EffectThegreenhouse effectisaprocessbywhichthermalradiationfromaplanetarysurfaceisabsorbedbyatmosphericgreenhousegases,andisre-radiatedinalldirections.Wordsthermal:mladj.热的，热量的n.上升暖气流planetaryplnitriadj.行星的Sincepartofthisre-radiationisbacktowardsthesurfaceandtheloweratmosphere,itresultsin

2、anelevationoftheaveragesurfacetemperatureabovewhatitwouldbeintheabsenceofthegases.Wordselevation,eliveinn.高地；海拔；提高；崇高；正面图Large PopulationIndustryForests Keep DisappearingTemperatureAworldwidegreenhouseeffectmightproduceadangerouslywarmerworld.Sincethelate19thcentury,theaverageglobaltemperaturehasinc

3、reasedbetween0.3Cand0.6C.Internationally.Estimatesofglobalaveragetemperatureshaveprojectedanincreaseofasmuchas5beforetheyear2100.However,itwouldalsomeanthatsomecountrieswhicharefurthernorthwouldbeabletogrowcropstheyhadneverbeenabletobefore.Rising Sea LevelsTheotherseriousworryisthatrisingsealevelsfromthemeltingofthepolaricecapscouldseverelyfloodmanycountries.Ariseinsealevelsofonemeter,whichmanyexpertsarepredictingbytheyear2100,wouldflood15%ofEgypt,and12%ofBangladesh（孟加拉）.TheMaldives（马尔代夫）intheIndianOceanwouldalmostcompletelydisappear.Thank you!