Two years ago this week, the sea-floor wellhead that burst in the Gulf of Mexico, sending 4.9 million barrels of oil into the water, was capped. After three months, the end of the largest oil spill in the industry's history was in sight.
With the help of nearly 2 million gallons of toxic chemicals known as dispersants, BP and government agencies
involved in the response managed to prevent most of the oil from reaching the shoreline. But while the Gulf Coast's seafood and tourism industries are recovering, scientists see worrying signs in longterm effect, like the rising deaths of dolphins and sea turtles.