Again, the issue is whether you are just regulating part of the economy. Right now we're just looking at the California policy on carbon content in fuel. I note that my colleague Robert Stavins, from Harvard, has just done an analysis of some of the California policies, and I was just reading that this weekend.
I would say that mandating a percentage of ethanol in vehicles is not necessarily a bad thing. You just need to have that as part of a set of policies that ensure there are not parts of your economy that can use the atmosphere as a freeway receptacle. I can't give you a lot of details in the time we have, but that may work. I'm not sure.