I was listening to Harry Shearer, who always has some scathingly sarcastic things to say about current events. And he said…
In Canada, apparently, there is a regulation (a simple regulation such as could be implemented in the U.S. without even the approval of Congress, since it's at the level of the sort of thing the EPA could do by decree) that says that when an oil well is dug, a "relief well" must be added within the same season. If such a regulation had been in place – and obeyed, obviously – in the Gulf of Mexico, then BP's "missing solution" to the oil leak problem would have already been in place, and the oil would not currently be flowing into the Gulf.
Thanks Harry.