Not to detract from your valid point that we should curb global warming, but if all the glaciers and ice caps melts the sea level will rise by approximately 70 meters according to the USGS[1], so that would make it impossible for it to rise even more than what it did in the past 20k years, but I also think that if that rise of 70 meters will happen, it will take less than 1k years.

[1]: https://www.usgs.gov/faqs/how-would-sea-level-change-if-all-...