Mezue ahịrịokwu na-esonụ: N'afọ 1989, ụgbọ mmiri "Exxon Valdez" kụrụ n'ebe a na-akpọ Prince William Sound,
na-awụfu karịa nke mmanụ na-adịghị ọcha n'elu ụsọ oké osimiri. Taa, a na-ahụ agha dị n'etiti nkà ihe ọmụma nke mmepe na ichebe ihe e kere eke ná arụmụka ahụ na-akpata esemokwu banyere mkpọpu mmanụ na Arctic National Wildlife Refuge na Pebble Mine ahụ a chọrọ ịrụ.