NY Times warmist Justin Gillis suggests that CO2 might cause the oceans to rise 80 feet; if the entire Greenland ice sheet melts "sea level will fall across an area stretching more than a thousand miles from the ice sheet"

Sea Level and the Limits of the Bathtub Analogy - NYTimes.com

The paleoclimate record, as it is known, suggests that even a slight amount of global warming can produce a rise of 25 or 30 feet. And if scientists are anywhere close to right in their projections, the warming over the coming century due to human activity is going to be more than slight. That means a long-term rise in sea level of as much as 80 feet cannot be ruled out.
...
If we get a global increase of sea level of several feet by the end of this century, as many scientists expect
...
The ice sheets on Greenland and Antarctica are immense, and it turns out they exert enough gravitational pull to draw a substantial amount of ocean water toward them. So if you imagine the whole Greenland ice sheet melting, for instance, something quite bizarre will happen nearby: sea level will fall across an area stretching more than a thousand miles from the ice sheet.