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1、Lecture1PartIVReadingComprehension(ReadinginDepth)(25minutes)SectionBPassageOneGlobalwarmingmayormaynotbethegreatenvironmentalcrisisofthe21stcentury,butregardlessofwhetheritisorisn’t–wewon’tdomuchaboutit.Wewillargueoveritandmayeven,asanation,makesomefairlysolemn-soundingcommitment
2、stoavoidit.Butthemoredramaticandmeaningfulthesecommitmentsseem,thelesslikelytheyaretobeobserved.AlGorecallsglobalwarmingan“inconvenienttruth,”asifmerelyrecognizingitcouldputusonapathtoasolution.Buttherealtruthisthatwedon’tknowenoughtorelieveglobalwarming,and–withoutmajortechnologi
3、calbreakthroughs—wecan’tdomuchaboutit.From2003to2050,theworld’spopulationisprojectedtogrowfrom6.4billionto9.1billion,a42%increase.Ifenergyuseperpersonandtechnologyremainthesame,totalenergyuseandgreenhousegasemissions(mainly,CO2)willbe42%higherin2050.butthat’stoolow,becausesocietie
4、sthatgrowricherusemoreenergy.Weneedeconomicgrowthunlesswecondemntheworld’spoortotheirpresentpovertyandfreezeeveryoneelse’slivingstandards.Withmodestgrowth,energyuseandgreenhouseemissionsmorethandoubleby2050.Nogovernmentwilladoptrigidrestrictionsoneconomicgrowthandpersonalfreedom(l
5、imitsonelectricityusage,drivingandtravel)thatmightcutbackglobalwarming.Still,politicianswanttoshowthey’re“doingsomething.”ConsidertheKyotoProtocol(京都议定书).Itallowedcountriesthatjoinedtopunishthosethatdidn’t.Butithasn’treducedCO2emissions(upabout25%since1990),andmanysignatories(签字国)
6、didn’tadopttoughenoughpoliciestohittheir2008-2012targets.Thepracticalconclusionisthatifglobalwarmingisapotentialdisaster,theonlysolutionisnewtechnology.Onlyanaggressiveresearchanddevelopmentprogrammightfindwaysofbreakingdependenceonfossilfuelsordealingwithit.Thetroublewiththegloba
7、lwarmingdebateisthatithasbecomeamoralproblemwhenit’sreallyanengineeringone.Theinconvenienttruthisthatifwedon’tsolvetheengineeringproblem,we’rehelpless.57.Whatissaidaboutglobalwarminginthefirstparagraph?A)Itmaynotproveanenvironmentalcrisisatall.B)Itisanissuerequiringworldwidecommit
8、ments.C)Seriousstepshavebeentaken
