ution?2.Whatisthesecondsolutiontoreduceairpollution?keykeySuggestedanswer:Toomanycarshavecausedalotofseriousproblemsinourworld.Besidescongestion,accidentsandfastfuelconsumption,carsareresponsibleforagoodpartofairpollutioninbigcities.Onepossiblesolutionistodesignanddevelopcleancarsandcleanfuels.InShanghai,someofthepublicbusesbegintorunonnaturalgas,whichdoesnotgiveoffasmuchcarbondioxideaspetrol.ReturnSuggestedanswer:Anothersolutionistodevelopmodernpublictransportationsystemsandrestricttheuseofprivatecars.Ifthepriceofpetrolrisesconstantlyandthepublicvehiclesareefficientandconvenientenough,mostpeoplewillnotbuyprivatecars.Thus,thetotalnumberofcarsinbigcitieswillreducegreatly.Onthewhole,theeliminationofairpollutionneedsthecollectiveeffortsfromthegovernment,thepublicandtheenvironmentalists.Return
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