Well, we have tested that explicitly, and we've tested it at different points in time.
We've found, for example, that when you ask Canadians, Americans, or Mexicans for that matter, should we have a bilateral or trilateral approach to various things, the environment has always been one of those things where people say, you know what, the environment doesn't respect political geography, species move across borders, and air and water moves, so it makes sense to cooperate on these issues—and more so than on other issues, on which they'd say, well, I'm not so sure I want to have a joint immigration policy.
What's interesting about the environment and climate change is that when you look at the issue of climate change and you blend it with issues of energy self-sufficiency—which is a much more attractive proposition for the United States, which would like to free itself from some of the geopolitically unstable regions where it currently goes to get oil, which they think increases their security risk—and when you factor in what's on the table for Canadians, and Mexicans for that matter, freer access to a less thickened border, for example, would be something of interest to us.
There seems to be a growing consensus among everybody that doing something about the climate and climate change is the single largest long-term challenge, not just in terms of social virtue, but as a real economic exigency, as people look at things like the faltering manufacturing sector and wonder how upper North American society is going to evolve to meet the challenges of a post-carbon society.
So when we blend energy, borders, and climate change together, we find that support dramatically increases in all three countries: Mexico, Canada, and the United States. That becomes a very attractive North American project.
I do hasten to point out that it's much easier to talk about things in a bilateral framework, but on some of these issues where you want to have the political emphasis behind it, perhaps this kind of a question is best framed as a North American issue, including Mexico as well. That's something that would take a little bit more time to get into.