Last year's Gulf of Mexico oil spill was caused by a number of "flawed decisions" by BP and its contractors as well as poor government oversight, according to a report from the National Academy of Engineering and the National Research Council. The report also urged energy companies to make major adjustments to the design of blowout preventers to avoid a repeat of the incident. "The industry has already taken significant steps to enhance the capability to prevent, contain and respond to a potential spill," Erik Milito, the American Petroleum Institute's upstream director, said in response to the report.

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