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1、Unit6EffectsonClimateandEcologicalEnvironmentAfterUnit6,thstudentsshouldunderstand:-thesourcesandtypesofgreenhousegases-theconceptofgreenhousegaseffect-effectsofgreenhouseeffectonclimatechange-theinternationaleffortsincontrollinggreenhouseeffectIGreenhouseeffect1-isanaturalwarmingprocesso
2、ftheearth.Whenthesun'senergyreachestheearthsomeofitisreflectedbacktospaceandtherestisabsorbed.Theabsorbedenergywarmstheearth'ssurfacewhichthenemitsheatenergybacktowardspaceaslongwaveradiation.Thisoutgoinglongwaveradiationispartiallytrappedbygreenhousegasessuchascarbondioxide,methaneandwat
3、ervapourwhichthenradiatetheenergyinalldirections,warmingtheearth'ssurfaceandatmosphere.2ConsequencesofthegreenhouseeffectSealevelsrise,possiblyasmuchastwofeet,bytheendofnextcentury.Risingtemperaturescouldleadtochangesinregionalwindsystemswhichwouldinfluenceglobalrainfalldistributionandlea
4、dtotheredistributionandfrequencyoffloods,droughtsandforestfires.Windstormsandhurricanescouldbecomemorefrequentandmoreintense.Increasedseatemperatureswouldcausecoralbleachingandthedestructionofcoralreefsaroundtheworld.Climatechangewouldcreatefavorableconditionsforgrowthininsectpopulations.
5、Thiswouldlikelyhaveanegativeeffectonagricultureandhumanhealth,andresultinaspreadofmalariaandothertropicaldiseases.Watersupplieswouldbecomedisruptedinsomeregions,particularlyinalreadyvulnerable,aridareas.IINewWordsandExpressionsCO2induced,CO2引起的climaticmodel气候模型,naturalfluctuationinclimate
6、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,153nationssignedTHEUNITEDNATIONSFRAMEWORKCONVENTIO
7、NONCLIMATECHANGE,effectivein1995-1997,KyotoProtocol-outcomeof1997,morethan160nationsmetinKyoto,Japan,tonegotiatebindinglimitationsongreenhousegasesforthedevelopednations,pursuanttotheobjectivesoftheFrameworkConventiononClimateChangeof1992.-Commitment:thedevelopednat
