If climate change gets out of control, will the US try to annex Canada?

[Person Man]

It really depends on how bad it gets. My guess is that it will be on the levels of what globalization did as the world became more or less rebuilt by 1970. I admit that’s the optimistic scenario.

The best case scenario is that nothing happens and the worst case scenario is that world becomes like the Mesozoic in a few hundred years. Some people say that because the sun is now more luminous than it was in the Mesozoic Era, the outright habitability of the planet might be jeopardized. In my mind, neither of these things will happen.

I could see that the amount of ariable land remains constant as the polar ice caps and tundra becomes pine forests and tall grass fields. A lot of the current boreal and hemiboreal areas might become like the south today and a lot of the subtropics might become fully tropical. This may or may not offset beaches being 10 feet below water or places like Texas, Wyoming, Andalusia, or Pakistan being entirely dried out or places like Arizona or Libya being too hot for water to remain liquid in direct sunlight....but hey! Chicago will be like Tennessee and be the biggest nonflooded city and Orlando won’t have any more of those freak bomb cyclones in January anymore!

[Person Man]

Annexing Canada unilaterally (essentially a conquest) would not be good; Canada should only join the US (or vice versa) through the consent of the population living there. That said, I am strongly in favor of an economic union with Canada as soon as it is politically feasible. There is absolutely no reason why there cannot be a customs union and common economic market between the two countries with complete freedom of movement (yes, I want an EU-style union between the US and Canada but without the common currency).

There are practical needs for this but also some practical opposition as well. Both countries are hard to get into from each other. My guess is that about a quarter of the population in both the US and Canada can’t go into each other. This is mainly that people don’t want each other’s “trouble makers” or even petty “pains in the asses” who have relatively recently been caught doing things though are not serious, are particularly tasteless.