Sure, absolutely. As you may remember, one of the issues surrounding NAFTA was whether or not there should be an explicit provision excepting bulk water removal. What was done with NAFTA was interesting. There was a fix, if you will. They didn't change NAFTA, but they—meaning the three governments—issued a statement contemporaneous with NAFTA, essentially saying they didn't think that bulk water, or water in its natural state, fell within the purview of NAFTA, at least the trade obligations of NAFTA. It would still fit within the investment obligations of NAFTA, which is something you'd have to keep an eye on.
Yes, of course it's possible to do that. I think as a practical matter, it would be difficult to revisit NAFTA now, but you could do it. You could have an amendment to NAFTA.
With respect to the sharing of water, there are international norms with respect to obligations of upper and lower riparians. Interestingly, Canada and the United States are in a unique position in that regard because of the International Boundary Waters Treaty. We, in the International Boundary Waters Treaty, have certain rules, both with respect to boundary and transboundary waters. There are different rules depending upon whether they're boundary or transboundary waters. Those rules probably diverge from customary international law. Certainly our treatment of transboundary waters is different from international law, and indeed so is our treatment of boundary waters.
There's nothing that stops Canada and the United States from doing that. It is perfectly open to two states to depart from customary international law and adopt their own rules, and that's what's happened with the International Boundary Waters Treaty. So yes, there are customary rules of international law, but those rules are largely irrelevant, as between Canada and the United States, because of the existence of the International Boundary Waters Treaty.
On the point of lake levels, I'm not a hydrologist, but I do know what is the major forum in which that has been discussed. It has been discussed for decades because, as you know, sometimes you have high lake levels, and sometimes you have low ones. The International Joint Commission has had a number of references dealing with lake levels. That seems to be the venue that both nations are comfortable with in terms of addressing this in a cooperative manner.