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I have a question which might betray ignorance - why wouldn't humans still be able to live in colder countries which are now warm countries?

I agree that 5-8C warming will lead to mass death through war, famine. But why would Siberia be too hot for habitation for the remaining population (whether that's 100 or 500 million people)?

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You can't grow food and crops in suddenly warmed up permafrost earth. Generating nutrient rich soil takes a long time (decades to centuries for long lasting results). Global temperature rises are happening too fast.

Some humans will survive. There are a lot of us and it's a big planet.

When permafrost melts, it turns into a bog. Over decades and centuries, many of those bogs would dry out, but most of Siberia will be one great big morass for generations after it melts.

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