A Louisiana National Guard blackhawk flies over marshland on April 19, 2011 in route to Middle Ground in southern Louisiana. A year after the BP oil spill coated Gulf coast marshes and beaches, BP claims that most of the oil has been removed. Louisiana Wildlife and Fisheries says, however, that much of the cleaning has been superficial, as the oil has seeped into the soil, killing marshes and further eroding the state's damaged delta ecosystem.
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