All feedback loops to Global Warming increase and speed-up Warming. Info about Sea level rise was published in 'Science': 'Sea Changes', years ago.
Besides CO2 in the air, 'Popular Mechanics' had an article about this in 1964, the Earth Orbit swings, this has an influence on heat we get.
Not all times with same soot ppm will reach same Sea Level rises.
There are more dangers: reduced cloud cover, lower albedo, will raise Heat entry at day, Heat irradiation at night, in winther.
Temperatures will have a wider range from high to low. More moist will go up in the air in summer, meaning stronger hurricanes, heavier snowfall in winther.
If Sea temperatures go high enough, Oceans will cease being a CO2 sump, will start sending CO2 to the air.
If Sea bottom waters become hot enough, the clathrates on floor will release Methane; fires took place in harbors in recent Tsunamis, from waves stirring sediments releasing Methane.
Some sediment studies point Sea Level rise was sometimes quite fast, enough as to say it happened during European winther, meaning water came from Antarctica.
With fast CO2 release, as the Decan volcanoes in India, mass species extinction took place.
The Methane content in permafrost is huge, even if CH4 can ignite spontaneously upon entering atmosphere, lasts no more than 2 years in the air, it's a much more powerful Greenhouse effect gas than CO2.
Are your cows farting Methane? Feed it with algae.
Is a Wet Greenhouse possible? I'd say yes, but can't provide figures about chances.
Is this an Star Wars batte? Perhaps, perhaps, perhaps. (Xavier Cugat, Pérez-Prado)
Many coastal areas will drow, good for NYC, Pentagon, London, Paris, Flanders, Berlin, they bother a lot, but a human emergency in sites as Bangladesh.
There were forecasts of whole Paris going under water, except Sacre Cœur temple in Montmartre. From this, you can estimate Sea level prospectives.
The technology exists as to reduce Greenhouse effect gases emissions, just the Politics are missing; as first step, put on hold the 'programmed obsolescence', reduce taxation for energy-savings devices and procedures.
The future had an anthem: '5 feet high and risin', Johnny Cash, it fell short.
The situation is racing, time is ending.
Cool or perish!
Blessings +