File photo shows smoke billowing from a controlled burn of the Deepwater Horizon gulf oil spill off the Louisiana coast in the Gulf of Mexico

 
File photo shows smoke billowing from a controlled burn of the Deepwater Horizon gulf oil spill off the Louisiana coast in the Gulf of Mexico
Smoke billows from a controlled burn of the Deepwater Horizon gulf oil spill off the Louisiana coast in the Gulf of Mexico in this June 13, 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/Sean Gardner/Files (UNITED STATES - Tags: ANNIVERSARY BUSINESS DISASTER ENERGY ENVIRONMENT)