<translate>  Ụfọdụ nime ndị a bụ ọdachi mberede nke nuklia mere na Chernobyl , Ukraine ; mgbawa nke ụgbọ mbara igwe bụ Challenger ; na nkwafu mmanụ e nwere mgbe ụgbọ mmiri bụ Exxon Valdez na - ebu mmanụ kpọkaara nkume na Prince William Sound , Alaska . 