So far, up to 3.6 million barrels of oil have spilled into the Gulf. The size of the Macondo oilfield has been estimated as being anywhere from 25 to 100 million barrels. It is unclear how much of that oil-in-place would escape upward into Gulf waters if its flow remained completely unchecked, but it is safe to assume that at least half, and probably a much greater proportion, would eventually drain upward. That means many times as much oil would enter the Gulf waters as has done so until now.
We would all prefer not even to contemplate such a scenario, much less live with it. But the more I learn about the technical issues, and the worse news gets, the more likely this scenario seems. We all hope that a relief well will succeed in stopping the oil flow sometime around August, and that until then BP will be able to siphon off most of the oil escaping through the riser and damaged blowout preventer. But one has to wonder: is anyone at the White House seriously considering the worst-case scenario? And what should citizens be doing to prepare, just in case?