<prompt> Qedela umusho olandelayo: Ngo-July 2, 1987, ithangi i-Glacier Bay lashayisa into eyayicwile eMontague Strait futhi kwachitheka amalitha kawoyela angu - 460 000. Lo mkhumbi wawusendleleni eya endaweni yokucwenga eCook Inlet usuka eValdez, e-Alaska, lapho kwenzeka lesi sigameko. I-Sedge yathunyelwa njengesikhungo sokulawula esintantayo semikhumbi engu-21 eyayizama ukuthola uwoyela. Ngo - March 24, 1989, elinye ithangi elaliphuma eValdez labhekana nesiphetho esibi nakakhulu.  <response>: I - Exxon Valdez yaphahlazeka eBligh Reef ePrince William Sound lapho kwakutheleka khona uwoyela ongahluziwe. Kwasungulwa Isimiso Sokuvimbela Nokukhipha Amafutha Amanzi Avulekile futhi iSedge yakhipha amamitha angaphezu kuka-8 900 kawoyela olwandle. Ngezikhathi ezahlukahlukene ngesikhathi sokuphendula ukuchitheka waphinde wenza ukuhlolwa komugqa ogwini nemisebenzi yokulawula ukuhamba kwezindiza. Ngo - 1990 iqembu le - Sedge lakha isibani esikhanyayo manje esiphawula iBligh Reef. 