The last time Earth was as warm as it is now was about 125,000 years ago. And we know sea level was 6 meters higher than it is today.
Sea Level Rise Is Accelerating: 4 Inches Per Decade (or More) by 2100 | InsideClimate News
Sea level rise is accelerating: 4 inches per decade possible by 2100 via
Scientist: these findings are a "game-changer" for the climate discussion