Comment by zahlman

> Oh and roughly 65M of sea level rise as the planet shifts to a snow/ice-free mode.

Current rates of sea level rise are still in single digit millimetres per year (https://en.wikipedia.org/wiki/Sea_level_rise), so that would take millennia. If there's even enough ice in the caps to get that far. Pre-historically, vast ice sheets covered broad swaths of regions now considered "temperate" (per the famous XKCD, "Boston [was] buried under almost a mile of ice"); what remains is a tiny portion and it's simply hard to imagine that it could fill the seas to such an extent.

If you have detailed calculations, please feel free to cite them. But my back-of-the-envelope reasoning: NOAA gives an average sea depth (https://oceanservice.noaa.gov/facts/oceandepth.html) of 3,682 meters. You propose that this could increase by nearly 2%. But the density of water only exceeds that of ice by about 9% (via https://en.wikipedia.org/wiki/Ice); the thickness of the https://en.wikipedia.org/wiki/Antarctic_ice_sheet is only about half that average sea depth; and it covers only about 4% of the water-covered area of the planet (14 million km^2 vs. 361 million km^2, per https://en.wikipedia.org/wiki/Earth) which is not even all oceanic.