汽车与空气污染(Car and Air Pollution)

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toomanycarshavecreatedalotofseriousproblemsinourworld.besidescongestion,aidentsandfastfuelconsumption,carsareresponsibleforagoodpartofairpollutioninbigcities.allthetime,theyarepumpinghugeamountsofwastegasesintotheatmosphere.

thesegasesareveryharmful,causingdiseaseandevendeath.onepossiblesolutionistodesignanddevelopcleancarsandcleanfuels.inshanghai,someofthepublicbusesbegintorunonnaturalgas,whichdoesnotgiveoffasmuchcarbondioxideasthepetrol.

butitmaytakedecadesforthenewmodelsofcleancarspletelyreplacethetraditionalones.anothersolutionistodevelopmodernpublictransportationsystemsandrestricttheuseofprivatecars.ifthepriceofpetrolrisesconstantlyandthepublicvehiclesareefficientandconvenientenough,mostpeoplewillnotbuyprivatecars.andthetotalnumberofcarsinbigcitieswillreducegreatly.

onthewhole,theeliminationofairpollutionneedsthecollectiveeffortsfromthegovernment,thepublicandtheenvironmentalists.