The reasons for that would really deal with political opposition to pollution taxes. The fact that other countries have been able to move forward with pollution taxes suggests to me that we need to find the political will to put those in place.
You could even compare us to the United States. In the United States, the Clean Air Act and the Clean Water Act, both of which are federal environmental laws, impose requirements on the states to collect taxes on air pollution and water pollution respectively. You can't find a more hostile country in the world to new taxes than the U.S. They've been able to put in place these pollution taxes, and I think it behooves us to do the same.
One of the problems that I've heard from speaking with officials at Environment Canada is that there's no explicit authorization for environmental taxes in CEPA as it stands today. There's reference to permit-trading systems and other economic instruments, but you won't find that specific authorization. I think it's really important to put that in there to enable us to move forward.