Before I turn the final questioning over to Mr. Woodworth, I just want to follow up on one comment that Mr. Cullen made and see if you can give clarification. It's the difference in pricing of carbon between us and the United States. In the Waxman-Markey bill they are talking about carbon rising to a cost of $26 a metric tonne by 2019. You guys as economists must be familiar with the recent report that was put together by MK Jaccard, where they are stating that under the Canadian targets the carbon price will be around $100 a tonne, and if we adopt the Bill C-311 targets, carbon will have to go up to $200 a tonne by 2020.
I'm just wondering if you have comments on why there is this discrepancy if we want to have an integrated approach.