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1、①Ifhumansweretrulyathomeunderthelightofthemoonandstars,wewouldgoindarknesshappily,themidnightworldasvisibletousasitistothevastnumberofnocturnal(夜间活动的)speciesonthisplanet.Instead,wearediurnalcreatures,witheyesadaptedtolivinginthesun’slight.Thisisabasicevolutionaryfact,eventhoughmost
2、ofusdon’tthinkofourselvesasdiurnalbeings.Yetit’stheonlywaytoexplainwhatwe’vedonetothenight:We’veengineeredittoreceiveusbyfillingitwithlight.Thebenefitsofthiskindofengineeringcomewithconsequences一calledlightpollution一whoseeffectsscientistsareonlynowbeginningtostudy.Lightpollutionisl
3、argelytheresultofbadlightingdesign，whichallowsartificiallighttoshineoutwardandupwardintothesky.III-designedlightingwashesoutthedarknessofnightandcompletelychangesthelightlevels一andlightrhythms—towhichmanyformsoflife,includingourselves,haveadapted.Whereverhumanlightspillsintothenatu
4、ralworld,someaspectorlifeisaffected.Inmostcitiestheskylooksasthoughithasbeenemptiedofstars,leavingbehindavacanthaze(霾)thatmirrorsourfearofthedark.We’vegrownsousedtothisorangehazethattheoriginalgloryofanunlitnight—darkenoughfortheplanetVenustothrowshadowonEarth—iswhollybeyondourexpe
5、rience,beyondmemoryalmost.We’velitupthenightasifitwereanunoccupiedcountry,whennothingcouldbefurtherformthetruth.Amongmammalsalone,thenumberofnocturnalspeciesisastonishing.Lightisapowerfulbiologicalforce,andonmanyspeciesitactsasamagnet(磁铁).Theeffectissopowerfulthatscientistsspeakofs
6、ongbirdsandseabirdsbeing“captured”bysearchlightsonlandorbythelightfromgasflaresonmarineoilplatforms.Migratingatnight,birdstendtocollidewithbrightlylittallbuildings.Frogslivingnearbrightlylithighwayssuffernocturnallightlevelsthatareasmuchasamilliontimesbrighterthannormal,throwingnea
7、rlyeveryaspectoftheirbehavioroutofjoint,includingmostothercreatures,wedoneeddarkness.Darknessisasessentialtoourbiologicalwelfare,toourinternalclockwork,aslightitself.Livinginaglareofourownmaking,wehavecutourselvesofffromourevolutionaryandculturalheritage—thelightofthestarsandtherhy
8、thmsofdayandnight.Inaveryr
