Pedzisa mutsara unotevera: Muna 2007 mushumo weUnited States Environmental Protection Agency pamusoro pekudonha wakawedzera kukura kunofungidzirwa kwenzvimbo yakasvibiswa uye huwandu hunofungidzirwa hwekudonha kusvika ku, zvakapetwa katatu kudarika
Exxon Valdez yakasviba. Mushumo wacho wakatsoropodzawo nhamburiko dzokudzorera uye kunonoka kuchangobva kuitika kwokuchenesa.