I'm trying to think of the most recent numbers. Various prices on pollution have led to decreases in fuel use across the board. Sometimes there are other emissions coming from those countries for other reasons that wind up pushing up or negating some of the progress that carbon prices do. That's been the experience in British Columbia, for example, where emissions were actually on a downward trajectory, and then, partially because the price got frozen for a couple of years, emissions went flat.
Most of the experts I've ever spoken to about this would say it does not work by itself. It needs to be embedded in a larger climate policy package that further increases the opportunities to use other fuel sources and that increases investment in renewable energy technology and emissions technology and that sort of thing. The hope is that it makes all of those things work more efficiently.