It is my belief that the clean air act tabled today, which gives Environment Canada the power to regulate not just greenhouse gases but also other air emissions, is on very firm constitutional footing. In other words, the federal government has the power to regulate the emission of greenhouse gases and other pollutants.
It's also the case that the federal government, I believe, is on very strong constitutional grounds in exercising its powers under the Fisheries Act, for example. I don't think the federal government has any role to say, well, we think you should only go to three oil sands plants over the next ten years, rather than five. It's a matter for the Province of Alberta.