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A massive scientific effort is ongoing to precisely quantify the environmental damage caused by the oil spill—whether measured in oily sediments or missing generations of sealife. This is both part of the Natural Resource Damage Assessment http://www.darrp.noaa.gov/about/nrda.html to determine what and how much BP will have to pay as well as an undertaking to understand a unique oil spill: one that happened more than 1,500 meters beneath the sea's surface, spewed roughly 5 million barrels of oil before it was plugged.
What is clear, however, is that the approximately 5 million barrels of Lousiana sweet crude that spewed into the Gulf of Mexico was toxic—a toxicity exacerbated by the use of 1.8 million gallons of dispersant both in the deep sea and at the surface. The oil itself sports an array of so-called polycyclic aromatic hydrocarbons—benzene, toluene and the like, which are known to cause cancer. At the same time, they are compounds that fish and other organisms are efficient at ensuring that it doesn't end up in their tissue.
In addition, BP's Macondo well oil itself smothered birds; more than 8,000 such birds representing 102 different species were collected—2,263 of them already dead—by government workers. Of course, this is likely just a fraction of the birds impacted since an oil-coated bird at sea sinks. The Center for Biological Diversity estimates that the oil spill killed or harmed approximately 82,000 birds as well as more than 6,000 sea turtles and 25,000 marine mammals, such as various species of dolphins.
And, unfortunately, the oil that did reach the coast—nearly 700 kilometers of marshland and 235 kilometers of beach was oiled, according to the government's Shoreline Cleanup Assessment Teams—"is very persistent once it gets up in the marsh grass," Miles says. http://www.epa.gov/oem/content/fss/fss09/scat.htm
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