It depends on who else is in the game with us, in some sense. If you think of this as a Canada-U.S. issue, whether we are net buyers of permits from the U.S. or we sell them, then it depends on the relative strength of the targets that are being met through the permits. So in some sense it depends on the number of permits that we emit relative to the number of permits the U.S. emits. The more permits we emit, the more likely it is we're going to be a net seller, depending on any given level of target. Similarly, the more permits the U.S. emits, the more likely it is that we're going to be buying from them.
As Professor Dissou has mentioned, if you have a North American trading platform, what essentially happens is you have one price of emissions through the permit mechanism. Now, it may be that we'll need additional measures to meet our targets that are emissions-specific, as opposed to just a permit system. That's a different story.