高中英语 VOA常速听力2012年11月合辑(文本)Global-Warming-Might-Threaten-Water-Supply素材.doc

高中英语 VOA常速听力2012年11月合辑(文本)Global-Warming-Might-Threaten-Water-Supply素材.doc

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1、VOA常速英语听力2012年11月合辑(文本):Global-Warming-Might-Threaten-Water-SupplyRosanneSkirbleNovember11,2012Globalwarmingoverthenextcenturycouldsignificantlyreducetheamountofwintersnowpackinmountainousareasinthenorthernhemisphere,accordingtoanewstudypublishedinNatureClimateChange.Seasonalsnowpackmeltisa

2、nessentialsourceoffreshwater,anditslosscouldthreatendrinkingwatersupplies,agriculturalirrigationandwildlifeecosystems.StanfordUniversityclimateexpertNoahDiffenbaughledthestudy,whichcomparessnowpackconditionsacrossthenorthernhemisphereinthelate20thcenturywithclimatemodelprojectionsforthenext

3、onehundredyears.DeceasingsnowpackThoseprojectionsarebasedonarangeofscenarioswhichforeseeariseinaverageglobaltemperaturesofbetweentwoandfourdegreesCelsius.ThestudyconcludesthataveragesnowaccumulationwilldecreaseinmostregionsoftheWesternUnitedStates,Europe,CentralAsiaandtheHimalayas,comparedt

4、ohistoricalpatterns.Itprojectsthatlowandextremelylowsnowfallswouldexceedthelowsofthelater20thcenturybetween10and30percentofthetimewithtwodegreesofwarming.And,Diffenbaughsays,"Iftheplanetwarmsby4degreesCelsius,theUnitedcouldexperiencesnowpackaccumulationsbelowthelevelsofthelate20thcenturyupt

5、o80percentoftheyears.”Thestoryisthesameinotherpartsofthenorthernhemisphere,wheresnowpackisanatural,andcritical,waterreservoir.WaterworriesThestudyfindsthatanearlyspringmeltwouldbringmorewaterintothewatershedsoonerthanusual,potentiallyfloodingrivers,lakesandartificiallydammed-river-3-reservo

6、irs.Andwithlesswateravailablelaterintheseason,chancesformorewildfires,pests,andspeciesextinctionsincrease.Diffenbaughsaysthistimingwouldalsoexacerbatedroughtconditionswhenthedemandforwaterisgreatest.“Wecaninferthatshouldthesephysicalclimatechangesoccurinthefuture,thattherewouldbeimpactsonwa

7、tersupplyforagricultureandforhumanconsumptionandfornaturalecosystemsifthewaterstorageandmanagementsystemsarenotadaptedtothosechanges.”Accordingtoclimatemodels,extremeraineventsareexpectedtoincreaseastheplanetwarms.However,Diffenbaughsays,thatwon’tchangeh

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