I'd be speculating to give you a precise answer.
I'll go back to what I said earlier. Just as there's a built-in incentive to reduce energy, because it's a major cost, and therefore reduce greenhouse gas emissions, a price on carbon can also be a disincentive to investment, potentially. But the issue of carbon taxes or a cap and trade.... For us it's important that any approach be international in scope, because you can disadvantage one jurisdiction against another, potentially.
I come from B.C., where there is a carbon tax. They've tried—not, I would say, with complete success—to make it revenue-neutral. It hasn't been to such an extent that it has put B.C. at any kind of disadvantage relative to other provinces, but the risk is there. Any government that pursues this has to do so very carefully.