What I was about to speak to is collective action problems. You're probably familiar with the term “tragedy of the commons”. It goes all the way back to Aristotle, I believe. It's about human society not necessarily looking after the commons properly, and the incentives there are to destroy the commons in individual actions that add up to the collective destruction of the commons.
That's true of a lot of things. Canada is not big enough to be a large player in just about anything if you look at the fact that there are about 200 countries in the world. We have a special responsibility with respect to water, forests and several things of which we have a large share, but yes, we're all in this together. It's a whole-of-planet problem.
There is the potential for certain countries to choose to adopt what's called a free rider approach to the detriment of others. If too many of them adopt a free rider approach, we will unfortunately not meet our Paris targets and we will have a tragedy of the commons.