What do you know today that you didn't know yesterday?

[Dmitry1983]

Yes, other than relocating some people from islands in Pacific Ocean there is no real economic harm.

So two problems you're not noting here:

Not all countries contain boreal (or other cold enough) regions that you naively believe can be made arable with warmer temperature. And even in countries that do, that may be a small percentage. IOW, how is Canada going to be of much help to countries, say, along the Equator?

Canada can export food to those countries.

To be arable, there needs to also be adequate supply of water. IOW, not so dry as to not be able to promote food growth.

Shouldn't air become more humid because of higher temperatures?