Thirty years ago, a massive Exxon Valdez oil tanker spilled nearly 11 million gallons of oil into the pristine Prince William sound off Alaska’s coast, affecting 1,300 miles of coastline. It was the worst oil spill in the history of the United States. Local ecosystems were devastated, hundreds of thousands of birds and fish were killed, and the corporation was hit with more than a half billion dollars in liabilities.