A better and much more recent proxy observation for the effect of a warming climate is the Eemian [1] aka the last interglacial. Peak temperature 125k years ago

A better and much more recent proxy observation for the effect of a warming climate is the Eemian [1] aka the last interglacial. Peak temperature 125k years ago was at least 2 C higher than today, and global sea-level was 8-9 m higher (of which less than 0.5 m is attributable to thermal expansion of ocean water). Scandinavia was an island. [1] https://en.wikipedia.org/wiki/Eemian https://en.wikipedia.org/wiki/Eemian