[英语学习]新风尚大学实用英语第四册课后练习答案forunit

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1、Unit7EnvironmentalProtectionPassageATheNextBigClimateChallengeBackgroundKnowledge1.GlobalwarmingGlobalwarmingistheincreaseintheaveragetemperatureofEarth'snear-surfaceairandoceanssincethemid-20thcenturyanditsprojectedcontinuation.Accordingtothe2007FourthAssessmentReportb

2、ytheIntergovernmentalPanelonClimateChange(IPCC),globalsurfacetemperatureincreased0.74 ± 0.18 °C(1.33 ± 0.32 °F)duringthe20thcentury.Mostoftheobservedtemperatureincreasesincethemiddleofthe20thcenturywascausedbyincreasingconcentrationsofgreenhousegases,whichresultsfromhum

3、anactivitysuchasfossilfuelburninganddeforestation.ClimatemodelprojectionssummarizedinthelatestIPCCreportindicatethattheglobalsurfacetemperatureislikelytoriseafurther1.1to6.4 °C(2.0to11.5 °F)duringthe21stcentury.Theuncertaintyinthisestimatearisesfromtheuseofmodelswithdif

4、feringsensitivitytogreenhousegasconcentrationsandtheuseofdifferingestimatesoffuturegreenhousegasemissions.Anincreaseinglobaltemperaturewillcausesealevelstoriseandwillchangetheamountandpatternofprecipitation,probablyincludingexpansionofsubtropicaldeserts.[4]Warmingisexpe

5、ctedtobestrongestintheArcticandwouldbeassociatedwithcontinuingretreatofglaciers,permafrostandseaice.Otherlikelyeffectsincludechangesinthefrequencyandintensityofextremeweatherevents,speciesextinctions,andchangesinagriculturalyields.Warmingandrelatedchangeswillvaryfromreg

6、iontoregionaroundtheglobe,thoughthenatureoftheseregionalvariationsisuncertain.Thescientificconsensusisthatanthropogenicglobalwarmingisoccurring.Nevertheless,politicalandpublicdebatecontinues.TheKyotoProtocolisaimedatstabilizinggreenhousegasconcentrationtopreventa"danger

7、ousanthropogenicinterference”.AsofNovember2009,187stateshavesignedandratifiedtheprotocol.2.RelatedwebsitesorWebPageshttp://en.wikipedia.org/wiki/Global_warminghttp://topics.nytimes.com/top/news/science/topics/globalwarming/index.htmlhttp://www.worldviewofglobalwarming.o

8、rg/TeachingDesign1.TheStructureoftheTextPartsParagraphsMainIdeaofEachPartPartOneParas1-4Whatisclimatemodelandi