We haven't seen a study comparing the environmental impacts that would fall out of that constrained case.
When we look at the 1.2 million barrels a day for rail, we have rail loading capacity of just under 1.1 million barrels a day now. And that has been added since 2011, when essentially there was nothing, so it's very quick to bring it on. But there are other issues, including rail cars, and congestion on the line, etc. That's certainly one of the uncertainties, but it looks like a very feasible number.