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1、Themostobviousreasonisthegrowingtrendofoverpopulationinmajorcitiesaroundtheworld.Withtheirpopulationskyrocketingtoanunprecedentedlevelofover1-millioninsomegiantcitiessuchTokyo,Shanghai,andMexicoCity,theurbaninfrastructureisoftenhard-pressedtocopewiththeproblemofprovidingclea
2、nwatertocitydwellers.Moreover,inanattempttoprovideadequatefoodsuppliestotheirhugepopulations,manydevelopingcountriesareundergoingalarge-scaleagriculturalexpansionthatrequiressignificantlymorewaterresourcesforirrigationandlivestockfarmingthanbefore.Also,waterasanessentialcomp
3、onentoftheirproductionisincreasinglydemandedbyvariousindustries,suchasfabric,chemistryandmanufacturing.Otherreasonsthatresultinaglobaldearthofwatersuppliesincluderampantdeforestation,encroachingdesertificationandcontaminationofrivers,lakesandundergroundwater.Facedwiththisdau
4、ntingchallenge,thefirstpriorityisforgovernmentstoadjusttheireconomicpolicies,promotesustainabledevelopmentandstopdamagingthenaturalenvironment.Besides,ThirdWorldcountriesneedtolaunchnationwidecampaignstoadvocatethebenefitsofbirthcontrolandeducatecitizensontheuseofcontracepti
5、vedevices.Also,thepublic’secologicalawarenessshouldberaisedtoahigherlevelwherepeopleofallagescanunderstandtheutmostimportanceofpreservingnaturalresourcesandswitchaccordinglytomoreenvironmentallyfriendlywaysoflife.Inaddition,everyfamilycanbeencouragedtoreusewaterwithinthehous
6、ehold.Forexample,inmostAsiansocietieswherericeisthestaplefood,thewaterusedaftercleaningricecontainsvariousnutrientsforplantgrowthandisanexcellentdetergenttoflushthetoilet.Furthermore,theintriguingideaofconvertingtheinexhaustibleseawatertofreshwatersupplieswillbetheultimateso
7、lution.unprecedented[ʌn’presidəntid]adj.前所未有的,无前例的Theaircrashcausedanunprecedentednumberofdeaths.这次空难的死亡人数是空前的。infrastructure[’infrə’strʌktʃə]n.基础设施;基础结构Vastsumsareneededtomaintaintheinfrastructure.保养基础设施需要巨额款项。dwell[dwel]vi.居住,住Thosetwomenaredwellingwithus.那两个人跟我们住在一起。under
8、go[’ʌndə’ɡəu]vt.经历,承受Heunderwentalotofhardshipsinhischildhood.他在童年时代经历了许多坎坷
