Unit 8 Focus on Global Warming综合教程二

Unit1Unit8FocusonGlobalWarmingPre-readingActivities-Audiovisualsupplement1AudiovisualsupplementCulturalinformationWatchthevideoandanswerthefollowingquestions.1.Whereistheplaceinthevideo?2.Isitpossiblethatourplanetwillbelikethisinthefuture?Why?Theearth.Butnotthesameearthwherewearelivingnow.Inthevideo,therearerubbishanddusteverywhere.Andthecitymayhavebeenabandoned,becausethereisnobodyonthestreetbutarobot.It’squitepossible.HumanbeingshavecausedtoomanytroublestotheEarth:airandwaterpollution,energycrisis,globalwarming,etc.Pre-readingActivities-Audiovisualsupplement2AudiovisualsupplementCulturalinformationVideoScript1AudiovisualsupplementCulturalinformationSinging:Closeyoureyesandseeitlisten,Barnaby.Listen,Barnaby!PutonyourSundayclothes.There’slotsofworldoutthere.Getoutthebrilliantineanddimecigars.We’regonnafindadventureintheeveningair.Girlsinwhiteinaperfumednightwherethelightsarebrightasthestars.PutonyourSundayclothes.We’regonnaridethroughtowninoneofthosenewhorsedrawnopencars.We’llseetheshowsatDelmonico’s.Andwe’llclosethetowninawhirl.Andwewon’tcomehomeuntilwe’vekissedagirl...Culturalinformation1AudiovisualsupplementCulturalinformationGlobalwarmingistheincreaseintheaveragetemperatureofEarth’snear-surfaceairandoceanssincethemid-20thcenturyanditsprojectedcontinuation.Mostoftheobservedtemperatureincreasesincethemiddleofthe20thcenturywascausedbyincreasingconcentrationsofgreenhousegases,whichresultsfromhumanactivitysuchasfossilfuelburninganddeforestation.GlobalwarmingCulturalinformation2AudiovisualsupplementCulturalinformationAnincreaseinglobaltemperaturewillcausesealevelstoriseandwillchangetheamountandpatternofprecipitation,probablyincludingexpansionofsubtropicaldeserts.WarmingisexpectedtobethestrongestintheArcticandwouldbeassociatedwithcontinuingretreatofglaciers,permafrostandseaice.Otherlikelyeffectsincludechangesinthefrequencyandintensityofextremeweatherevents,speciesextinctions,andchangesinagriculturalyields.GlobalReading-TextanalysisStructuralanalysisTextanalysis1.Fromwhichperspectivesdoesthetextaddresstheissueofglobalwarming?Thetextaddressestheissuefromthreeperspectives—thegeneralpublicconcern,itscausesandconsequences,andpracticalactionstotackletheproblem.TextanalysisStructuralanalysis2.What’stheauthor’spurposeofwriting?Toraisepeople’sconsciousnessofthepotentialdangersofglobalwarming,andtosuggestsomeactionstocombatit.GlobalReading-TextanalysisStructuralanalysis1ParagraphsMainidea1-23-78-11Theauthortellsthereasonwhypeoplearenowincreasinglyconcernedaboutglobalwarming.Theauthortracesthecausesofglobalwarminganddiscussestheconsequencesofit.Theauthorputsforwardsomesuggestionsonwhatistobedone.1.Dividethetextintopartsbycompletingthetable.TextanalysisStructuralanalysisStructuralanalysis32.Figureoutthesub-ideasinthesecondpart.1)thecausesoftherisingconcentrationofgreenhousegasesintheatmosphere(Paragraphs3and4)2)theeffectofsuchconcentrationonclimatechange(Paragraphs5and6)3)thepotentialthreatofglobalwarmingtohumanhealthandsurvival(Paragraph7)MainideaStructuralanalysis1Twenty-fiveyearsagoifyoumadeatriptothelocallibraryandperusedtheperiodicalsectionforarticlesonglobalwarming,you’dprobablyhavecomeupwithonlyafewabstractsfromhardcoresciencejournalsormaybeablurbinsomeesotericgeopoliticalmagazine.AsanInternetsearchonglobalwarmingnowattests,thesubjecthasbecomeasrootedinourpublicconsciousnessasMadonnaormicrowavecooking.FocusonGlobalWarmingDetailedreading1DetailedreadingJohnWeier2Perhapsallthisattentionisdeserved.Withthepossibleexceptionofanotherworldwar,giantasteroid,oranincurableplague,globalwarmingmaybethesinglelargestthreattoourplanet.Fordecadeshumanfactoriesandcarshavespewedbillionsoftonsofgreenhousegasesintotheatmosphere,andtheclimatehasbeguntoshowsomesignsofwarming.Manyseethisasaharbingerofwhatistocome.Ifwedon’tcurbourgreenhousegasemissions,thenlow-lyingnationscouldbeawashinseawater,rainanddroughtpatternsacrosstheworldcouldchange,hurricanescouldbecomemorefrequent,andElNinoscouldbecomemoreintense.Detailedreading2DetailedreadingDetailedreading33Whathasworriedmanypeoplenowisthatoverthepast250yearshumanshavebeenartificiallyraisingtheconcentrationofgreenhousegasesintheatmosphere.Ourfactories,powerplants,andcarsburncoalandgasolineandspitoutaseeminglyendlessstreamofcarbondioxide.Weproducemillionsofpoundsofmethanebyallowingourtrashtodecomposeinlandfillsandbybreedinglargeherdsofmethane-belchingcattle.Nitrogen-basedfertilizers,whichweuseonnearlyallourcrops,releaseunnaturalamountsofnitrogenoxideintotheatmosphere.DetailedreadingOurWarmingPlanet4Oncethesecarbon-basedgreenhousegasesgetintotheatmosphere,theystaytherefordecadesorlonger.AccordingtotheIntergovernmentalPanelonClimateChange(IPCC)sincetheindustrialrevolution,carbondioxidelevelshaveincreased31percentandmethanelevelshaveincreased151percent.Paleoclimatereadingstakenfromfossilrecordsshowthatthesegases,twoofthemostabundantgreenhousegases,areattheirhighestlevelsinthepast420,000years.Manyscientistsfearthattheincreasedconcentrationsofgreenhousegaseshavepreventedadditionalthermalradiationf