Mr. Boyd, that was a very interesting presentation on carbon tax. I just want, for all of our sakes, to better understand the relationship between that and possible cap and trade systems, and also the international implications.
I think I heard you say Norway also has a cap and trade system and also does international trading in an emissions market. Of the five countries we've talked about—Norway, Switzerland, Sweden, Finland, and Denmark—how many of them actually achieve part of their goals through international trading of carbon credits?