Please try to answer this: how did poverty and hunger reduce so dramatically in the last 100 years.
I'm reasonably extrapolating much like most economists would.
Also here's my other bet: even the WORST areas in the planet would see prosperity and better living conditions in 100 years compared to today. That's how it has always been, unless you come up with tail risks due to climate change which I don't personally buy.
1) Development of industrial processes for the production of ammonium sulphate and other synthetic fertilizers;
2) Development of internal combustion motors and their application in agricolture.
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Try extrapolating like climate scientists do.
Trad econ has as much predictive value as fantasy football.
Try Spain, for example. Wikipedia: "Over 30% of the area is already severely impacted by desertification". Agriculture will depend more on irrigation, and there will be less water available.
There will be enough food for people to live there, yes. But agricultural yield is expected to go down by ~20% or so if emissions continue. And people sitting in worse spots are not just going to sit there and wait for the flood and die. There will be wars about who gets the resources from the new best places.