It's certainly an issue that comes up in discussions among the members of the United States Climate Action Partnership. Unfortunately, it's an issue that gets more and more difficult to deal with as we have more delay at the federal level and as more states come online with their own programs.
At the beginning, you saw states and regions acting in a vacuum in a situation in which they did not want to be compelled to act. But they just saw the inaction over many years by the federal government and felt they had to step in to fill that void. Now we've moved to them actually implementing some legislation and regulation and taking a lot of time to do it.
So I think there will be more reticence among states and non-governmental organizations--environmental groups--to support abandoning the state policies or regional initiatives in favour of a federal program. And that's going to be true the further down the line we get without a federal program.
I do think that a tough federal program would make it less likely that we would need to see states doing, for example, cap and trade. We might have, as we have a tradition of having in this country, states setting tougher standards or complementary standards for efficiency, or for vehicles, in the case of California. But it would be really unfortunate, I think, if we had a number of cap and trade programs that couldn't work together.