The polluter-pays principle is a very good discussion to have. I think it's important to define how to draw that circle. If we draw that circle solely on the production side of the equation and ignore the demand side of the equation in terms of who the polluters are, we're never going to get the level of engagement in our society that's going to be necessary for the transformational change we're talking about. In other words, I'm suggesting that for each of us, when we drive our automobiles, if we don't become conscious of the fact that we're contributing to greenhouse gas emissions, both from our tailpipe and from upstream, then we're going to have a serious problem on our hands.
I'll finish with a reminder. If you look at greenhouse gas emissions from a barrel of oil, 20% are related to its production, 80% are related to its end use.