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1、CarsandPollutionInnowadays,astheincreasingofpeople’slivinglevel,moreandmorefamiliesbuycarsfortheconvenienceoflivingnecessary.However,Toomanycarshavecreatedalotofseriousproblemsinourworld.Besidescongestion,accidentsandfastfuelconsumption,carsareresponsibleforagoodpartofairpollutioninbigcit
2、ies.Allthetime,theyarepumpinghugeamountsofwastegasesintotheatmosphere.Thesegasesareveryharmful,causingdiseaseandevendeath.Onepossiblesolutionistoinventanddevelopcleancarsandcleanfuels.Intheworld,busesinsomecitiesaredrivenbyelectricity,whileothersbegintousenaturalgas,whichdoesnotgiveoffasm
3、uchcarbondioxideasthepetrol.Butitmaytakedecadesforthenewmodelsofcleancarstocompletelyreplacethetraditionalones.Anothersolutionistodevelopmodernpublictransportationsystemsandrestricttheuseofprivatecars.Ifthepriceofpetrolrisesconstantlyandthepublicvehiclesareefficientandconvenientenough,mos
4、tpeoplewillnotprivatecars.Andthetotalnumberofcarsinbigcitieswillreducegreatly.
