It's closer 1 one degree in the last 120 years, than 20, for a global average, though polar areas are bearing more of the brunt.

Unless AMOC collapses and we foolishly trip into another glacial period, the 200ft increase in sea level is inevitable in the next thousand years, but totally manageable for the continents. It's the oceanic mountaintops, aka, low level islands, and coastal cities that are at risk. Most of those cities are already filled with happy rich people who will have been long gone decades, or even centuries before Florida and Bangladesh are submerged and Russia, Australia and Canada are booming with happy with abundant rainfall, crops and awesome weather.

It just seems like focusing on ameliorating pain and focusing on the making the inevitable a better outcome is the most important focus for the next few decades.