Waterisveryimportanttous.Factoriesandplantsneedwaterforindustrialusesandlargepiecesoffamp3landneeditforirrigation.Withoutwatertodrink,peopledieinashorttime.
Todaymostwatersourcesaresodirtythatpeoplemustpurifywaterbeforedrinking.Waterbecomesdirtyinmanyways:industrialpollutionisoneofthem.Withthedevelopmentofindustry,plantsandfactoriespourtonsofindustrialwastersintoriverseveryday.Therivershavebecomeseriouslypolluted,andthewaterisbecomingunfitfordrinkingorirrigation.Thesamethinghasalsohappenedtoourseasandoceans.So,theproblemofwaterpollutionisalmostworldwide.
Scientistsofmanycountrieshavedonealotofworktostoppollution.Thepollutedwaterinsomeplaceshasbecomecleananddrinkableagain.Perhapsonedaythepeopleinalltownsandcitieswillbedrinkingcleanwater.Thatday,webelieve,isnotveryfaroff.