I think there are three different ideas, two are emissions based and one is non-emissions based.
One, I think the Russian hot air credits, which I've spoken extensively about, are not good enough for Canada.
Two, I have concerns about international trading. By taking taxpayers dollars, in the end we'd deal with the one challenge of greenhouse gas reductions and not the twin challenges of reducing smog and pollution, which I have concerns about. As well, Canada would be left behind in the green economy if all of our money went offshore. I prefer the same airshed.
I suppose the third area that could be related, but not quite as much, is the clean development mechanism that some people have asked me to consider. I've agreed to look at it, and I have looked at it. Only a very small number of megatonnes around the world are available in the ODA 2012 figure, and it really doesn't offer much for Canada.