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CarsandPollutionInnowadays,astheincreasingofpeople’slivinglevel,moreandmorefamiliesbuycarsfortheconvenienceoflivingnecessary.However,Toomanycarshavecreatedalotofseriousproblemsinourworld.Besidescongestion,accidentsandfastfuelconsumption,carsareresponsibleforagoodpartofairpollutioninbigcities.Allthetime,theyarepumpinghugeamountsofwastegasesintotheatmosphere.Thesegasesareveryharmful,causingdiseaseandevendeath.Onepossiblesolutionistoinventanddevelopcleancarsandcleanfuels.Intheworld,busesinsomecitiesaredrivenbyelectricity,whileothersbegintousenaturalgas,whichdoesnotgiveoffasmuchcarbondioxideasthepetrol.Butitmaytakedecadesforthenewmodelsofcleancarstocompletelyreplacethetraditionalones.Anothersolutionistodevelopmodernpublictransportationsystemsandrestricttheuseofprivatecars.Ifthepriceofpetrolrisesconstantlyandthepublicvehiclesareefficientandconvenientenough,mostpeoplewillnotprivatecars.Andthetotalnumberofcarsinbigcitieswillreducegreatly.