现代大学英语精读4第二版unit5aforwantofadrink课文原文.pdf

该【现代大学英语精读4第二版unit5aforwantofadrink课文原文 】是由【1781111****】上传分享，beplayapp体育下载一共【6】页，该beplayapp体育下载可以免费在线阅读，需要了解更多关于【现代大学英语精读4第二版unit5aforwantofadrink课文原文 】的内容，可以使用beplayapp体育下载的站内搜索功能，选择自己适合的beplayapp体育下载，以下文字是截取该文章内的部分文字，如需要获得完整电子版，请下载此beplayapp体育下载到您的设备，方便您编辑和打印。,,itissaid,isthenewoil:aresourcelongsquandered,,glaciersvanishing,,,andtheremediessometimesill-conceived,,,?,60yearsago,theworld',,astheyhavethroughouthistory,,inaninspiredcombinationofnewcropbreeds,fertilizersandwater,,nearly7billiontoday,%attheturnofthe21stcenturyto45%'increasingdemandforwateriscausednotonlybythegrowingnumberofmouthstobefedbutalsobypeople'sdesireforbetter-tasting,,ittakesnearlytwiceasmuchwatertogrowakiloofpeanutsasakiloofsoybeans,,,too,%oftheworld'%.Together,thedemandsofthesetwocategoriesquadrupledinthesecondhalfofthe20thcentury,,orwhenitlappedatthesidesofNoah',broadly,thathoweveryouuseit,,thatisbecauseithasevaporatedfromtheEarth'ssurface,,andthewaterbelowit—over97%ofthetotalonEarth—,thesaltcanberemovedtoincreasethesupplyoffreshwater,%ofwaterthatisnotsalty,about70%isfrozen,eitheratthepoles,,exceptthoseinthesea,%,,sittinginlakesandreservoirsorflowinginriverswhereitis,withluck,,takenote,,—ountfor60%ofallavailablefreshsupplies—andamongthemonlyBrazil,Canada,Colombia,Congo,,butChinaandIndia,withoverathirdoftheworld'spopulationbetweenthem,havelessthan10%',,,—onecubicwaterweighsatonne—,—mostlyrivers,lakesandreservoirs—willnotflowfromonebasinintoanotherwithoutartificialdiversion,,thewaterupstreammaybeusefulforirrigation,,though,theopportunitiesdiminishtothepointwhereithasnousesexcepttosustaindeltas,,'',though,,thewaterunderground,oncelargelyignored,,andforawhileitseemedamiraculoussolution:drillaborehole,,however,fromtheUnitedStatestoIndiaandChina,'sbiggestcities,,forexample,drawover70%oftheirwaterfromanaquiferthatwillrundrywithin200years,,deep-,,,,wateriscertainlyvalued,,,butitisalsousedindrillingforandextractingoil,themakingofpetroleumproductsandethanol,,suchashydropowergeneration,consumelittlewater(afterdrivingtheturbines,mostisreturnedtotheriver),butsome,suchasthetechniquesusedtoextractoilfromsands,%ofwaterinrichcountriesand10%,11%and8%,,however,needabasicminimumoftwolitresofwaterinfoodordrinkeachday,-au-PrinceformorethanafewdaysafterJanuary'searthquakeunlesstheyhadaccesstosomewater-—usuallywomenorchildren—,,man',awayofkeepingclean,amechanismforremovingsewage,ahomeforfishandotheranimals,amediumwithwhichtoskateandsail,athingofbeautytoprovideinspiration,,