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1、Passage3RainmakerSometimesideasjustpopupoutoftheblue・OrinCharliePatorVscase,outoftherain."IwasinabusinMoroccotravellingthroughthedesert/heremembers・"ithadbeenrainingandthebuswasfullofhot,wetpeople.Thewindowssteamedupandowenttosleepwithatowelagainsttheglass
2、.WhenIwoke,thethingwassoakingwet.Ihadtowringitout.Anditsetmethinking.Whywasitsowet?〃Theanswer,ofcourse,wascondensation.BackhomeinLondon,aphysicistfriend,PhilipDavies,explainedthattheglass,chilledbytherainoutside,hadcooledthehothumidairinsidethebusbelowitsd
3、ewpoint,causingdropletsofwatertoformontheinsideofthewindow.Intrigued,Paton—一alightingengineerbyprofession-™startedrigginguphisownequipment."Imademyownsolarstills.Itoccurredtomethatyoumightbeabletoproducewaterinthiswayinthedesert,simplybycoolingtheair.Iwond
4、eredwhetheryoucouldmakeenoughtoirrigatefieldsandgrowcrops/Today,adecadeon,hisdreamhastakenshapeasagiantgreenhouseonadesertislandoffAbuDhabiinthePersianGulf——thefirstcommerciallyviableversionofhis"seawatergreenhouse."Localscientists,workingwithPatonunderali
5、cencefromhiscompanyLightWorks,arewateringthedesertandgrowingvegetablesinwhatisbasicallyagiantdew-makingmachinethatproducesfreshwaterandcoolairfromsunandseawater.InawardingPatonfirstprizeinadesigncompetitiontwoyearsago,MacroGoldschmied,presidentoftheRoyalIn
6、stitutionofBritishArchitects,calledit"atrulyoriginalideawhichhasthepotentialtoimpactonthelivesofmillionsofpeoplelivingincoastalwater-starvedareasaroundtheworld/Thedesignhasthreemainparts(seeGraphic).Thegreenhousefacesintotheprevailingwindsothathot,drydeser
7、tairblowsinthroughthefrontwallofperforatedcardboard,keptwetandcoolbyaconstanttrickleofseawaterpumpedupfromthenearbyshoreline.Theevaporatingseawatercoolsandmoistenstheair.LastJune,forexample,whenthetemperatureoutsidetheAbuDhabigreenhousewas46°C.Thecool,mois
8、tairallowstheplantstogrowfaster,andbecausemuchlesswaterevaporatesfromtheleavestheirdemandformoisturedropsdramatically.Paton'scropsthrivedonasinglelitreofwaterpersquaremetreperday,comparedto8litresiftheyweregr
