It was 19 months ago that the blowout of the British Petroleum Macondo well below Transocean’s Deepwater Horizon drilling platform triggered what has been called the greatest environmental disaster of its kind in U.S. history. The surge of about 210 billion gallons of oil into the Gulf of Mexico, which began April 20, 2010, and lasted through mid-July 2010, prompted not only expansive environmental cleanup efforts, but a widespread legal response as well.

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