<prompt> Qedela umusho olandelayo: Ngawo-1970, uHourani waphayona ukusetshenziswa kukakhonkolo oqiniswe kusengaphambili ukuze kuqiniswe ama-slabs emagcekeni nasezindongeni ezisekelayo. Ngo-2002, uHourani wasungula amafasitela aklanyelwe ukumelana neziphepho zeSigaba 4 no-5; waphinde wakha ubuchwepheshe obunelungelo lobunikazi be-skimmer yamafutha ephefumulelwe yi-  <response>: Inhlekelele yokuchitheka kukawoyela i-Exxon Valdez ngo-1989 e-Alaska, nokuchitheka kukawoyela i-Deepwater Horizon ngo-2010 eGulf of Mexico. 