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I worked for three and a half years in the Safety, Health, Environment and Security department of an offshore oil drilling company. We had rigs all over the world. Well control and enviromental management is critical in offshore drilling. I don't think that there would be much environmental impact at all if the US offshore was opened to drilling.
I agree with everything you said in your article except the part about the fouled beaches caused by oil spills. That may happen, but it is by no means a foregone conclusion. I think you will find that oil spills are more closely associated with oil transportation than offshore drilling.