File photo shows a hard hat from an oil worker lying in oil from the Deepwater Horizon gulf oil spill on East Grand Terre Island, Louisiana

 
File photo shows a hard hat from an oil worker lying in oil from the Deepwater Horizon gulf oil spill on East Grand Terre Island, Louisiana
A hard hat from an oil worker lies in oil from the Deepwater Horizon gulf oil spill on East Grand Terre Island, Louisiana in this June 8, 2010 file photo. When BP's Deepwater Horizon oil rig exploded and sank in the Gulf of Mexico last April, killing 11 workers, authorities first reported that no crude was leaking into the ocean. They were wrong. One year on, oil from the largest spill in U.S. history clogs wetlands, pollutes the ocean and endangers wildlife, not to mention the toll it has inflicted on the coastal economies of Florida, Mississippi, Alabama and especially Louisiana. REUTERS/Lee Celano/Files (UNITED STATES - Tags: ANNIVERSARY BUSINESS DISASTER ENERGY ENVIRONMENT)