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Associated Press
Oil from the Deepwater Horizon oil spill is seen in the root structure of a clump of marsh grass on a shoreline of Bay Jimmy in Plaquemines Parish, La., Thursday, April 18, 2013. At first glance, the marshy, muddy coastline of Bay Jimmy in southeast Louisiana appears healthy three years after the nation's worst offshore oil spill. Brown pelicans and seagulls cruise the shoreline, plucking fish and crabs from the water. Snails hold firm to tall blades of marsh grass. 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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