Firstly,byutilizingthesunandthewindtoproducecleanenergy,pollutionfromdirtyenergysuchasfossilfuelscanbegreatlyreduced.Theoveruseoffossilfuelssuchascoalhasgivenrisetotheemissionofpollutantslikenitrogenoxidesandcarbondioxidewhichareloomingasonemajorthreattoairquality.Accordingtotheofficialstatistics,carbondioxideemissionreached18.57milliontonsin1999,posingaseriousthreattoairquality,Therefore,harnessingsolarandwindenergycaneffectivelyreducepollutantsemissionfromfossilfuelsandsignificantlyimproveairquality.Secondly,renewableformsofenergysuchassolarandwindenergyarenon-pollutingandenvironmentallyfriendly,Itiswidelyacknowledgedthatsolarandwindenergyareclean,freeandinexhaustible.Theyprovideenergyforcooking,lighting,heatingandcoolingwithoutanydirectemissions.
Inconclusion,towinthebattleagainstairpollution,someurgentmeasureshavetobecarriedoutimmediately.Replacingfossilfuelswithsustainablecleanenergyisthetoppriority.(211words)