I dunno, but I'll say it again. A legal limit on how much carbon can be dumped into the air has nothing to do with free markets and everything to do with government intervention and enforcement. This is why the Liberals want no part of cap and trade - they would be responsible for enforcing something by way of visible hand policy if elected to power. Those guys sold our environment to American ownership and control. I can imagine a dozen ways in which a ruling Liberal government would continue to allow corporate USA to dictate Canada's national energy policy, like NAFTA, like SPP, deep integration, "TILMA" etc etc