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Aren't we hypothesizing a situation where there is no (or a much reduced) Greenland ice sheet? I'm imagining "hey, look at all this bare rock that's suddenly available, and it's gonna take a couple of thousand years for erosion and lichen to develop soil here, so lets take a short cut".

I'm not saying it's a good idea, I'm saying it's a theoretically possible idea in the face of an extinction-level event.

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Here is where you are incorrect in your anticipation. The amount of land usable for agriculture will be decreasing faster than the ice shields melt. The territory where the fertile soil is available will not be human-friendly for the entire season, if at all. You can't make people work at 50°C or even 45°C with 90° humidity. You can't breathe water...

https://ourworldindata.org/land-use

But "usable for agriculture" implies "has soil" to me. We're talking about moving the soil to a more temperate zone, and we're not talking about the current population of the planet, we're talking about the human species surviving.

(I'm trying to find a sea rise map that looks right by eye and not having much luck. Here's the North Atlantic at 10m[1]. Surely that's not enough flooding?)

[1] https://coastal.climatecentral.org/map/4/-10.3532/51.4503/?t...

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