Photo: Exxon Valdez Anniversary: 20 Years Later, Oil Remains



Two decades after the Exxon Valdez disaster—the worst oil spill in U.S. history—huge quantities of oil still coat Alaska's shores with a toxic glaze (above, an oil pool discovered during a recent field study in Prince William Sound), experts said in March 2009.

The oil—which has been detected as far as 450 miles (724 kilometers) away from the spill site in Prince William Sound—continues to harm wildlife and the livelihoods of local people, according to conservation groups.


Photograph courtesy Temple University


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