汽车污染(Car Pollution)

详细内容

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eachyearthereisanincreasingnumberofcarsontheroadsasmillionsofnewcarsareproduced.oneoutofsixamericansworksatmakingcars,drivingtrucks,buildingroadsorfillingupgas.americanscouldn'tlivewithoutcars!

mostamericanswouldfindithardtoimaginelifewithoutacar.however,somehaverealizedtheseriousproblemofairpollutioncausedbycars.thepollutedairbeespoisonousanddangeroustohealth.

onewaytogetridofthepollutedairistomakeacarwithoutpollution.buttobuildacleancariseasiersaidthandone.progressinthisfieldisslow.

anotherwayistoreplacecarengineswithsomethingelse.inventorsarenowworkingonsteamcarsaswellaselectriars.manymakersbelievethatitwilltakeyearstodevelopapracticalmodelforus.

topreventtheworldfrombeingpollutedbycars,wehavetomakesomechangesinourlives.americans,forexample,havetocutdownonthenumberoftheirtotalcars.theyareencouragedtousebicycles,whicharethoughttohelpkeeptheairclean.

butthischangedoesnoteeasily.alargenumberofworkersmayfindthemselveswithoutjobsifacarfactoryciosesdown.thustheproblemofairpollutionwouldbeelessimportantthanthatofunemployment.althoughcarshaveledustoabetterlife,theyhavealsobroughtusnewproblems.