<prompt> Qedela umusho olandelayo: Ngo-2007 umbiko we-United States Environmental Protection Agency mayelana nokuchitheka kwenyusa isilinganiso sobukhulu bendawo engcolisiwe kanye nomthamo wokuchitheka okulinganiselwa ku-, izikhathi ezintathu ezinkulu kune-  <response>: Ukuchitheka kwe-Exxon Valdez. Lo mbiko wabuye wagxeka imizamo yokuvuselela kanye nokwehla kwamuva kwenqubo yokuhlanza. 