I think one of the issues you're talking about is early action. That's an issue that was addressed in “Turning the Corner” and will probably have to be addressed in a cap and trade system. At this point in the regulatory regimes we have seen, we would not get adequate compensation for the early action our industry has taken. In any of these regimes, I think you tend to look for a starting point and then you reduce from that. A lot of our reductions in emissions occurred in the 1990s, I guess, and that was through engineering.
What happened, of course, is that we were dealing with high natural gas prices, and of course, any plant manager says that if they're purchasing natural gas at a very high price, they want to be as efficient as they can. So you take down what you call the low-hanging fruit; you do the easy things that make you more efficient. But now we're at the point where we've done all of that stuff and anything further is either extremely expensive or just isn't available.