HeIs: I live in Toronto, one of the warmest cities in Canada. The temp increase necessary to make this town bearable from Nov to April would put the entire state of Florida underwater (along with other nasty surprises). Sounds like an economist.

"The temp increase necessary to make this town bearable from Nov to April would put the entire state of Florida underwater (along with other nasty surprises)."

That could happen.

Prediction of "business as usual" includes +5 C by 2100.

That's 9 degrees F. And that 9 degrees includes the global average over the entire planet, including the 70% of water.

We know that land will change more, obviously, so Toronto will change more, and we know that with GW the polar latitudes will heat more than the equatorial ones (roughly), and that winter temps will increase more than summer temperatures.

Consider the possibility of a 20 degree F change in winter temperatures---on average---and now include some extreme warm events---that's a pretty big difference.

Florida might not be all underwater, but could be depopulated of permanent residents because of the occasional Category 8 hurricane and the unwillingness for any insurance company to write anything.

Besides, it would be unbearably hot and humid--110F with 100% humidity for 6 months of the year.