Inspired by the recent post[1] about the land below Antarctica looks like, I wondered how the Scandinavian peninsula might look after it finishes the post-glacial uplifting.
Is there any conclusion yet on whether global warming is likely cause polar ice to expand due to failing ocean currents? Or is it more likely that even with currents collapsing it gets so hot around the poles that the ice keeps melting?
Yes, there is, if you avoid the petrochemicals-funded loonies.
We are probably heading for about 3º–4º C of warming this century, which very strongly implies an ice-free Arctic and the collapse of the West Antarctic Ice Sheet. That alone suggests circa 5 metres of sea level rise, and Greenland will add more.
Isostatic rebound like this will be less than a rounding error in the overall picture.
Cloud cover modeling is, or was last I checked, wholly inadequate.
It seems entirely possible we could tip over into an ice age. If the whole planet became shrouded in fog, insolation would be reflected back without being converted to IR first, so not trapped by CO2. As temperature falls, ice spreads from the poles. Cloud cover dissipates. Ice takes up the job of reflecting insolation. Brrrr.
[1] https://news.ycombinator.com/item?id=34365110