Climateengineering:aquickfixorariskydistraction?气候工程：一劳永逸的锦囊妙计还是后患无穷的祸水东引？OnaTuesdayinAugust,LukeIsemandrovetwohourseastofOaklandindrought-strickenCaliforniatoaremotespotwherehelaunchedahandfulofballoonsfilledwithsulphurdioxideandheliumhighintothesky.Fromthere,heusedGPStotrytotracktheballoonsastheyroseintothestratosphere,thelayerofEarth’satmospherethatbeginsabout12kmhighandcontainstheozonelayerthatprotectstheplanetfromsolarradiation.Oncethere,theywouldburstandreleasethegas.Iseman’sstart-up,MakeSunsets,ispilotingsmall-scalestratosphericaerosolinjections:thesulphurdioxidereleasedbytheballoonsoxidisestoformanaerosol,orfinemist,ofs...