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1、Unit6EffectsonClimateandEcologicalEnvironmentAfterUnit6,thstudentsshouldunderstand:-thesourcesandtypesofgreenhousegases-theconceptofgreenhousegaseffect-effectsofgreenhouseeffectonclimatechange-theinternationaleffortsincontrollinggreenhouseeffectIGreenhouseeffect1-isanaturalwarmingprocess
2、oftheearth.Whenthesun'senergyreachestheearthsomeofitisreflectedbacktospaceandtherestisabsorbed.Theabsorbedenergywarmstheearth'ssurfacewhichthenemitsheatenergybacktowardspaceaslongwaveradiation.Thisoutgoinglongwaveradiationispartiallytrappedbygreenhousegasessuchascarbondioxide,methaneandw
3、atervapourwhichthenradiatetheenergyinalldirections,warmingtheearth'ssurfaceandatmosphere.2ConsequencesofthegreenhouseeffectSealevelsrise,possiblyasmuchastwofeet,bytheendofnextcentury.Risingtemperaturescouldleadtochangesinregionalwindsystemswhichwouldinfluenceglobalrainfalldistributionand
4、leadtotheredistributionandfrequencyoffloods,droughtsandforestfires.Windstormsandhurricanescouldbecomemorefrequentandmoreintense.Increasedseatemperatureswouldcausecoralbleachingandthedestructionofcoralreefsaroundtheworld.Climatechangewouldcreatefavorableconditionsforgrowthininsectpopulati
5、ons.Thiswouldlikelyhaveanegativeeffectonagricultureandhumanhealth,andresultinaspreadofmalariaandothertropicaldiseases.Watersupplieswouldbecomedisruptedinsomeregions,particularlyinalreadyvulnerable,aridareas.IINewWordsandExpressionsCO2induced,CO2引起的climaticmodel气候模型,naturalfluctuationincl
6、imate气候的自然波动,-tobewellrecognized得到很好认可-tobecharacterizedas表示….特性,刻画…性格-tobecharacterizedby具有….特征-intheshortterm/longterm短期/长期-takeintoaccount考虑-contributeto贡献-withsomethinginmind记住IIIKyotoProtocol-1992,theWorldSummitonEnvironmentandDevelopment,153nationssignedTHEUNITEDNATIONSFRAMEWORKCON
7、VENTIONONCLIMATECHANGE,effectivein1995-1997,KyotoProtocol-outcomeof1997,morethan160nationsmetinKyoto,Japan,tonegotiatebindinglimitationsongreenhousegasesforthedevelopednations,pursuanttotheobjectivesoftheFrameworkConventiononClimateChangeof1992.-Commitment:thedevelopednat
