Canada is likely to be spared the worst effects of climate change due to geography so it might not seem like such a serious problem to them. Even under the worst case scenario, Canada will still be self sufficient in staple crops. And any mass migrations will have to pass through the USA first.
People living through massive record forest fires in B.C. and Alberta probably won't agree with you.
Not to mention the water supply of Calgary and many other western Canadian cities is glacier fed, and the Bow Glacier that provides to Calgary may not be able to meet demand within the next 30 years... a problem that will only get worse with climate change.
Yes, the great lakes region looks better than most. And it will look desirable to a lot of displaced people...
