Mezue ahịrịokwu na-esonụ: N'afọ ndị 1970, Hourani bụ onye ọsụ ụzọ nke iji ihe a na-eme ka ọ dịkwuo mma maka ịmanye slabs na ọkwa na mgbidi na-akwado. N'afọ 2002, Hourani mepụtara windo windo ndị e mere iji guzogide ajọ ifufe nke 4 na nke 5; o chepụtara teknụzụ nwere ikike maka mmanụ skimmer nke sitere n'ike mmụọ nsọ
Ọdachi mmanụ Exxon Valdez nke 1989 na Alaska, na 2010 mmanụ mmanụ Deepwater Horizon na Gulf of Mexico.