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On April 20, 2010, the Deepwater Horizon platform drilling the Macondo Well in Mississippi Canyon Block 252 (DWH) exploded, killing 11 workers and injuring another 17. The DWH oil spill resulted in nearly 5 million barrels (approximately 200 million gallons) of crude oil spilling into the Gulf of Mexico (GoM). The full impacts of the spill on the GoM and the people who live and work there are unknown but expected to be considerable, and will be expressed over years to decades. In the short term, up to 80,000 square miles of the U.S. Exclusive Economic Zone (EEZ) were closed to fishing, resulting in loss of food, jobs and recreation. The DWH oil spill immediately triggered a process under the U.S. Oil Pollution Act of 1990 (OPA) to determine the extent and severity of the "injury" (defined as an observable or measurable adverse change in a natural resource or impairment of a natural resource service) to the public trust, known as the Natural Resources Damage Assessment (NRDA). The assessment, undertaken by the trustees (designated technical experts who act on behalf of the public and who are tasked with assessing the nature and extent of site-related contamination and impacts), requires: (1) quantifying the extent of damage; (2) developing, implementing, and monitoring restoration plans; and (3) seeking compensation for the costs of assessment and restoration from those deemed responsible for the injury. This interim report provides options for expanding the current effort to include the analysis of ecosystem services to help address the unprecedented scale of this spill in U.S. waters and the challenges it presents to those charged with undertaking the damage assessment.

BP Deepwater Horizon Explosion and Oil Spill, 2010. --- Natural resources --- Oil spills --- Management. --- Economic aspects --- Environmental aspects --- Oilspills --- Resource management (Natural resources) --- Resources management (Natural resources) --- BP Drilling Rig Explosion, 2010 --- BP Oil Spill, 2010 --- Deepwater Horizon Explosion and Oil Spill, 2010 --- Gulf Drilling Rig Explosion, 2010 --- Gulf of Mexico Drilling Rig Explosion, 2010 --- Gulf of Mexico Oil Spill, 2010 --- Gulf Oil Spill, 2010 --- Mexico, Gulf of, Drilling Rig Explosion, 2010 --- Mexico, Gulf of, Oil Spill, 2010 --- Environmental disasters --- Oil pollution of rivers, harbors, etc. --- Oil pollution of the sea --- Drilling platforms --- Deepwater Horizon (Drilling rig) --- Accidents --- BP Deepwater Horizon Explosion and Oil Spill, 2010 --- Restoration ecology --- Ecosystem services --- Cleanup&delete& --- Research --- Environmental aspects&delete& --- Finance --- Valuation --- U.S. Global Change Research Program. --- E-books --- Services, Ecosystem --- Ecology --- Ecological restoration --- Ecosystem restoration --- Rehabilitation ecology --- Restoration of ecosystems --- Applied ecology --- United States Global Change Research Program --- United States. --- USGCRP --- U.S.G.C.R.P. --- National Global Change Research Program (U.S.) --- US Global Change Research Program --- Climate Change Science Program (U.S.) --- Cleanup