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I appreciate the nuanced reply and yes, I do mean that you will not be able to produce as much food as you currently can nor will you be able to do so as reliably as we currently can.

And while you might be able to do it in Ireland — one of the only countries in the world with less people than two hundred years ago — it will likely be impossible to the billions living in far more densely populated countries.

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I think maybe there is a "frontier living" fantasy that is resting on the hidden assumption that you can bring your modern tech stack with you, minus the civilization that it relies on.

If I squint my eyes and imagine really hard, I can see living off the land, supported by small fusion reactors powering powerful AGI computer clusters, highly advanced 3D printers capable of producing all the physical support structure of life.

AGI + Power + Magic 3D printing and maybe one can live "off the land" with "civilization and all of human knowledge" hiding inside this portable tech stack.

FWIW this isn't even remotely close to what I was thinking - I definitely had no notions of AGI or 3d printing involved. You can do a lot with hand tools if you have plenty of time and a forgiving environment (access to water and trees for timber).

Very true, and I worry that as the planet heats many of those billions will die

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