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Associated Press
Water is seen eroding marsh grass on a remnant of Cat Island, a formerly dense and vibrant nesting sight for brown pelicans, egrets and roseate spoon bill, which was directly impacted by oil from the nation's worst offshore oil spill, is seen in Barataria Bay in Plaquemines Parish, La., Thursday, April 18, 2013. Underneath the surface, environmentalists and scientists fear there may be trouble, from tiny organisms to dolphins. Yet the long-term environmental impact from the spill is still not fully known and will likely be debated for years to come. (AP Photo/Gerald Herbert)

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