[cmrdporcupine]

That's not how it works. Climate change might lead to a modest average temperature increase in the northern parts of Canada and Russia but that is not necessarily going to make those places arable because along with climate change comes a dramatic increase in variability.

As we just saw in the PNW/BC heat bubble, climate change is not just an increase in average temp, it is a dramatic and worrisome increase in the standard deviation of temperatures. Which means here in Canada and in continental climates like Siberia there will be dramatic swings in temperature, forest fires, and drought. That is, there will still be extreme cold temperatures in the winter, just not reliably so, and summers could be all over the map.

It's already happening. Heat waves in April followed by very late frosts in May, for example. Hard to farm in those conditions, trust me.

Not to mention melting glaciers and declining snowpack means in the longer/medium term the rivers which provide the water for these vast continental regions dry up or shrink dramatically. See the Columbia Icefields / Athabasca glacier and the Bow glacier in western Canada. Not a good situation. Just came back from the Columbia Icefields and it's... as depressing as usual. Can't even walk up to the ice anymore like when I was last there a decade ago.

I'll just stay here in the great lakes, lots of water for now.