I think that would be a policy decision. You may want to pose that question to the government. I'm sure that my office will be going back and looking at the implementation of that regulatory approach in the years to come.
The other thing, which I think an honourable member raised earlier, is that Canada's stated position now is to, in step, harmonize with the United States. My understanding of the U.S. approach is that it is the sector-by-sector approach: transport, coal-fired, and other large point sources of greenhouse gas emissions.