BP is scaling back its cleanup efforts from the Deepwater Horizon oilspill in areas outside Louisiana. Here, a photo from last September shows alluvial clay and tar mats on the shore of Elmer's Island, in Jefferson Parish, La. Gerald Herbert/AP hide caption

itoggle caption Gerald Herbert/AP

The Deepwater Horizon oil rig burned on April 21, 2010. U.S. Coast Guard/Getty Images hide caption

itoggle caption U.S. Coast Guard/Getty Images