Yes. As we found out this morning, there's an awful lot of valuable learning that we can take in from the EU system. For example, as I've repeated on more than a couple of occasions, in developing a regulatory framework begin simply and gently. That's very much a lesson that's being taken on board in the United States.
The other thing I would note is in the development of the regional systems in the United States. Certainly with the regional initiative in New England, which is up and running, and in the development of the California greenhouse gas registry system as well, under Governor Schwarzenegger, they are very active, as Jos already mentioned, in discussions with the EU about the kind of system they're developing and they are very, very keen on making sure there are linkages.
You have the agreement, for example, between Prime Minister Blair and Governor Schwarzenegger, ensuring that in fact there is such a linkage. Clearly we are already beginning to see the beginnings of an international regime on this, as it were. It's important, number one, that we link, but number two, the sooner we get in on this game, the sooner we can make sure our particular sensitivities are sufficiently reflected that there's sufficient flexibility to address that.