First of all, I'd just highlight that the fuel burned in Canada in our gasoline use is as clean as any fuel in North America or in the world. We have sulphur removed from that fuel. That was through regulation. So the fuel quality exiting the refineries is equivalent to the best anywhere.
On life cycle greenhouse gas emissions, a lot of work is under way to benchmark Canada and Canadian oil sands versus those other crude sources. It appears the more data that comes available in that front is showing more close to equivalency that the oil sands are achieving relative to those other sources.
Quite simply put, we don't view the term “dirty oil” as appropriate at all.