Pollution:aSocialProblem

　　Whenwereadnewspapers,weoftencomeacrossthewordpollution.Thiswordwasnotfamiliartothepeoplesomedecadesago.Butnow,itisaseriousthreattousbecause.itmeansthepoisoningoftheair,seas,riversandlands,whichwoulddoharmtoourhealth.

　　Therearemanyfactoriesthatbringpollutiontous.Wecannothavefreshairinthemorning.Thisismainlybecauseofthepoisonoussmokecomingfromfactories,especiallychemicalones.Inrivers,seasandoceans,thereareindustrialwastes.Somefactoriesjustthrowtheirwastesintoseasorletthemflowintorivers.Whenpeopledrinkthewaterfromsuchrivers,theygetpoisoned.Besides,thereisrubbishfromshipsandwhensometimesanaccidentoccursinanocean,oilflowsoutfromtankers.

　　Onland,theaccumulationofrubbishinthestreetsmaydirtythecityandruinourhealth.Thisismainlyduetotheimproperdisposalofrubbishbypeople.

　　Ifwedomotfightagainstpollution,surelyonedayallofuswillbekilled.Somepeopleliketoputtheblameontheindustrialrevolutions.Onthecontrary,thepollutionproblemwillbesolvedonlywiththehelpofmodemscienceandtechnology.