Dee ihe na-aga n'ihu na paragraf a - Ike ọgwụgwụ n'ihi ịrụ ọrụ oge nile so mee ka e nwee ọtụtụ ọdachi ndị metụtara ọrụ, gụnyere ihe mberede ahụ mere na Three Mile Island
, ọdachi Space Shuttle Challenger na ọdachi Chernobyl. Akụkọ ikpeazụ Kọmitii Na-ahụ Maka Mmanụ Ala nke Alaska wepụtara banyere ọdachi mmanụ a wụfuru n'ụgbọ mmiri "Exxon Valdez" kwuru na "ọ ga-ekwe omume" na ịrụ ọrụ ọtụtụ awa mere ka ike gwụ ndị ọrụ ụgbọ mmiri ahụ, nke mekwara ka ụgbọ mmiri ahụ kpọkaa.