Almost all countries have ample space that will still be habitable for their entire population in 2100, even if climate change is left unchecked.
Those that don't represent a small portion of the global population, certainly less than 500 million people. I grew up in Botswana, and I know that "all of central Africa is uninhabitable" is not a likely outcome anytime soon. Most of Africa is actually really good land to live in, and will continue to be fairly good through the century.
In any case, Italy does not need to "park 10 million people in camps". Italy is a tiny country in terms of land area, so why would they need to take so many? Russia and Canada alone could easily fit a few billion immigrants each if global warming is really severe in a few centuries.
The notion that the only solution to climate change is to move everybody into already crowded places doesn't seem to have a base. We can solve the migration problem with or without moving people into Europe.
Anyways, my core point here is (a) we won't need to deal with this migration anyways, because we will solve climate change way before it becomes necessary, and (b) even if we didn't lower our emissions, I'm confident we can solve the migration problem without millions of deaths.
If we don't have a good answer to the relatively simple refugee migrations now (eg. Central America, Syria), then I have extreme pessimism that we will be able to manage a larger-scale, persistent event. Whereas with economic + political refugee situations we can always hope to resolve the root cause, with climate change it is simply the new normal.
Russia absolutely isn't going to do that, and who's going to pay to move them across the Atlantic to a country that they're not allowed to immigrate to?
I'm kind of leaning the other way: millions of avoidable deaths is the "normal war" situation, even if we magically solved climate change tomorrow.
That's a really dubious one. There's multiple issues with global warming, drought and desertification being one of them (and it probably will not affect a whole country) but the second one is just the max temperature the human body can, withstand especially with high humidity. When this threshold is passed, you can have thousands of people dying at the same time in your country. When every summer, heatwaves take a few of your neighbours you start reconsidering how nice your country is.
Remember, we're going to have more than a 2°C increase in mean temperature by the end of the century, and maybe 4°C. 4°C is the difference between now and the last ice age when the whole Europe was covered by huge glaciers.
Also, many people live near shores, which will be damaged frequently as the see level rises… How would India, who have a borderline genocidal tendency (fantasised mostly at the moment buy still frightening) against Muslims nowadays, react to the massive arrival of Bengali people coming from Bangladesh after a typhoon destroyed their land?
> Italy is a tiny country in terms of land area, so why would they need to take so many?
Because that's where they arrive… I'm not speculating when I talk about Italy, this is happening right now (not 10 millions, but hundred of thousands).
> Anyways, my core point here is (a) we won't need to deal with this migration anyways, because we will solve climate change way before it becomes necessary, and (b) even if we didn't lower our emissions, I'm confident we can solve the migration problem without millions of deaths.
Regarding (a), you should probably read this https://en.m.wikipedia.org/wiki/Emissions_budget
Regarding (b), I admire your confidence, but it sounds delusional in regard of the whole human history.
This is an issue, but increased atmospheric carbon and the latitude land distribution of the Earth probably means desertification will be net-negative for at least a while. (I don't have a source for this, but I recall reading that we have more trees today than ever in history?) Keep in mind, carbon is what plants eat.
> When every summer, heatwaves take a few of your neighbours you start reconsidering how nice your country is.
This is also a good point, but once again, there are also people who die from cold. I've been living in Toronto for the last year, and there are many people who die of cold in the winter every year, mainly the poor and elderly. It's not clear that global warming is net-negative at the moment for extreme temperature related deaths.
> we're going to have more than a 2°C increase in mean temperature by the end of the century, and maybe 4°C
I don't agree with this. This might be true if population+QoL growth continues and our emissions per capita stay at today's levels, but that won't happen. Like I said, we are going to fix CC by mid-century, and mean temp increase above pre-industrial levels will be less than 1.5°C by 2100 - not 4°C above today's levels.
> Because that's where they arrive
This is a different type of migration. Nobody is migrating internationally because their country is uninhabitable due to climate change, because there are no such countries today.
> About (a), you should probably read this...
Thank you, I'm aware of what's necessary to accomplish this. We are well on our way. If it wasn't for funding and regulatory limitations, I'm pretty sure we could be net-zero by 2028 just based on the technologies we have in development today.
> more trees today than ever in history?
Depending on how big you count history this sounds really implausible.
> carbon is what plants eat.
A slogan commonly repeated by global warming denialists, because it's true but highly misleading. Plants also primarily require water, and the temperature rise dries out a lot of places.
History := the recorded past (in this case I mean the last few hundred years)
> Desertification is currently increasing
Okay, you're right about this based on the link you sent. In my head I was considering arctic regions / tundra as desert as well, as their recent forestation rate is much faster.
> temperature rise dries out a lot of places
This is true but it also causes other places to become more humid. Higher temperature climate has more liquid water + more entropy ==> more active water cycle on global average. (This is a gross oversimplification but my point is that the increase in temperature is an increase in chaos, and so water that is currently frozen somewhere will be moving around.)
The important idea to note here is that we can't just ask "does global warming cause more X"? Because the answer can be yes in some areas and no in others, and an increase in X somewhere does not mean a net increase globally.