Mezue ahịrịokwu na-esonụ: Katzke's 1990 akwụkwọ akụkọ Oké Osimiri Mmanụ, nke kwuru banyere mmetụta mmadụ nke
Exxon Valdez Oil Spill na obodo Valdez, Alaska, ọ fọrọ nke nta ka ọ ghara ịpụ na steeti ahụ, mgbe Exxon degaara onye isi obodo akwụkwọ ozi iji dọọ aka ná ntị na ihe nkiri ahụ ga-emebi aha obodo ahụ. Otú ọ dị, mgbalị a egbochighị ka a hụ ihe nkiri ahụ n'ọtụtụ ebe, na July 1991, a gosipụtara Oké Osimiri Mmanụ dị ka akụkụ nke PBS "POV Showcase" pụrụ iche na gburugburu ebe obibi.