Well, I think that's a really good question. I don't know if I have the answer for it.
All the projections are that SO2 and nitrogen oxide emissions are increasing dramatically, and we are already beginning to see on the ground the effects of these emissions in that we now have a problem in western Canada that we've never had before, that of acid rain. It's like so much that has to do with the tar sands. It's another consequence of rapid development that hasn't been properly explored, and governments haven't been proactive about the issue.