Exxon Valdez - is finally gone

''Next year will mark the 20th anniversary of the Exxon Valdez oil spill - perhaps the most notorious human-caused environmental disaster in history.

But, according to the latest survey of Prince William Sound in Alaska - where the oil tanker foundered in 1989 - very little oil remains and most of what does is not in a form or location that can harm animals, plants or humans.

Boehm says he has carried out multiple biological investigations over the last decade - which have been confirmed by government scientists. "All of these government and Exxon-funded studies consistently show that the animals that wildlife use for prey are as clean as any in un-oiled locations in Prince William Sound," he says.

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