I think there has been behavioural change with respect to higher gas prices, for example, with the kinds of vehicles people are buying, but this is why I argue that the best way to actually address emissions from transportation from personal vehicles is to put in place regulations that mandate that we ramp up quite quickly the efficiency of vehicles that we're allowed to buy. The California standards may be the best proposal from a North American standard, but the California standards compared to those of Europe, China, and Japan--compared to anywhere else--are incredibly weak from a vehicle fuel efficiency standpoint.
So that's how you best capture those emissions. You put into place vehicle fuel efficiency standards that improve--