Co-operation is ideal, but it's not always possible if there is a divergence of interests. You mentioned [Technical difficulty—Editor] done an audit of Ontario's plan, which we concluded was not based on sound evidence, at least not for the 2019 plan that we looked at.
You can see the problems if you rely entirely on co-operation with another actor whose plan doesn't add up. I would say what you need to have is minimum standards at the federal level that will make sure you achieve the outcome, but allow for provinces and territories to displace that mechanism if they have equivalent, effective mechanisms.
That's possible under carbon pricing. It's possible under methane regulations and other areas, like species at risk and so on, where the provinces can act, but if they don't, the feds should come in and make sure it is not a case of “Oh, well, we hoped they had done something on this, but they didn't.” The federal government, as the one that has committed to the Paris Agreement and other agreements, needs to have that backstop to say that if there isn't sufficient action at the local, regional, provincial or territorial levels, then their system will apply.
That's true for a couple of areas, like carbon pricing and methane regulation, but not others.