Mezue ahịrịokwu na-esonụ:
Mmanụ Exxon Valdez nke 1989 site n'aka ụmụ amaala nke mpaghara ahụ iji nye olu maka obodo ndị metụtara mkpebi ụlọ ọrụ mmanụ na Prince William Sound, Gulf of Alaska, na Cook Inlet. Dị ka akụkụ nke nkwekọrịta nke 1990 na Alyeska Pipeline Service Company, Council na-enweta ego ma na-anọgide na-enweghị onwe ya kpamkpam site na Alyeska ọ bụrụhaala na mmanụ na-agafe na pipeline trans-Alaska. N'okpuru usoro nkwekọrịta ya na Alyeska, Council na-enyocha, na-enyocha, ma na-ekwu okwu banyere akụkụ dị iche iche nke ọrụ ụlọ ọrụ ahụ, ya bụ: mgbochi mmanụ mmanụ na atụmatụ mmeghachi omume, ikike nchekwa gburugburu ebe obibi, na mmetụta gburugburu ebe obibi dị adị na nke nwere ike ịnweta nke ọdụ ụgbọ mmiri na ọrụ tankị.