<prompt> Bhala okuqhubekayo kwalesi sigaba - Ngo-1970, uHourani waphayona ukusetshenziswa kukakhonkolo oqiniswe kusengaphambili ekuqiniseni ama-slabs ebangeni nasezindongeni ezisekelayo. Ngo-2002, u-Hourani wasungula amafasitela aklanyelwe ukumelana neziphepho zeSigaba 4 no-5; waphinde wakha ubuchwepheshe bokususa uwoyela obuphefumulelwe ukuchitheka kukawoyela e-Exxon Valdez ngo-1989  <response>: nenhlekelele yase-Alaska, nokuchitheka kukawoyela i-Deepwater Horizon eGulf of Mexico ngo-2010. 