I have some thoughts on this I’ll post as a comment. But basically the predictions of their re-shoring being a total bust were nonsense. It doesn’t matter at the end of the day if their efficiency is only 80% of that of their fabs on the island, if it’s enough to be part of what supplies the entire west with all they need for laptops and smartphones and gaming consoles then it’s enough to no longer need that occupied part of China or care what their actions taken against China result in as far as consequences.
That’s a bold statement, and not really sure what you base that on. For example, it’s almost certain that things won’t get as bad in Russia or Canada. The reality is that global climate is an incredibly complex system and nobody really knows how bad things will get, and where it will be the worst. For example, it’s quite possible that it’s actually cooler climates that will end up being more affected because that’s where the most drastic temperature changes will happen as opposed to places that are already close to global maximum.
Actually turning all that land into farm land would be a monumental project. The US isn’t even capable of maintaining its bridges right now that are at risk of imminent collapse, you really think that the US would be able to mobilize to turn a land area the size of France into effective farmland in time? https://www.popularmechanics.com/science/a62073448/climate-change-bridges/
The problem here isn’t purely technical, it’s a question of policy and logistics. The US is a dysfunctional state that’s not capable of marshalling large scale projects. Dealing with climate change is going to require a level of organization that’s simply not present in the country.
That’s one of the reasons both China and India keep Russia as a close partner. Europe is likely very much fucked however. Also worth noting that China is now leading the world in indoor farming, which is one of the best ways to mitigate unpredictable weather.