Handout file photo shows a Greenpeace campaigner walking through a patch of oil from the Deepwater Horizon gulf oil spill on a breakwater in the mouth of the Mississippi River where it meets the Gulf

 
Handout file photo shows a Greenpeace campaigner walking through a patch of oil from the Deepwater Horizon gulf oil spill on a breakwater in the mouth of the Mississippi River where it meets the Gulf
Greenpeace Senior Campaigner Lindsey Allen walks through a patch of oil from the Deepwater Horizon gulf oil spill on a breakwater in the mouth of the Mississippi River where it meets the Gulf of Mexico in Louisiana in this May 18, 2010 handout 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/Greenpeace/Handout/Files (UNITED STATES - Tags: ANNIVERSARY DISASTER ENERGY ENVIRONMENT) FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS