<prompt> Pedzisa mutsara unotevera: Mumakore ose okuma1980 na1990, nhamburiko dzesangano dzokupindura mhuka dzomusango dzakawedzerwa zvikuru kupfuura California. Vashandi veInternational Bird Rescue vakapedza mwedzi mitanhatu vachitarisira nzvimbo nhatu dzeshiri uye zvirongwa zviviri zvokutsvaka nokuunganidza muna 1989  <response>: Njodzi yeExxon Valdez, apo marita ane mamiriyoni 11 emafuta akasviba akadururira muPrince William Sound yeAlaska, achiuraya shiri dzomugungwa dziri pakati pe100 000 ne250 000. Exxon Valdez yakanga iri kudururwa kukuru kwokutanga uko kugadzikana kwemunda nokutakura zvakashandiswa zvikuru mukutarisirwa kwemhuka dzomusango dzakaiswa mafuta. 