Even if humankind manages to limit global warming to 2 degrees C (3.6 degrees F),..., future generations will have to deal with sea levels 12 to 22 meters (40 to 70 feet) higher than at present, according to research published in the journal Geology.
...this research highlights the sensitivity of Earth's great ice sheets to temperature change, suggesting that even a modest rise in temperature results in a large sea-level rise. "The natural state of the Earth with present carbon dioxide levels is one with sea levels about 20 meters higher than at present,"...
"Such a rise of the modern oceans would swamp the world's coasts and affect as much as 70 percent of the world's population."
"The current trajectory for the 21st century global rise of sea level is 2 to 3 feet (0.8 to1 meter) due to warming of the oceans, partial melting of mountain glaciers, and partial melting of Greenland and Antarctica."... [emphasis mine]
So while it won't happen overnight, this surge in ocean depth will happen.
The predicted sea level rise that Dallas reported 18 months ago now sounds rosy.
More precise predictions of sea level changes published in the journal Environmental Research Letters, the Institute of Physics journal, on October 1, 2012, are the first to predict sea levels rise due to climate change that included all potential sources of added fresh water to the world's oceans.
Even if the entire world adopted the Intergovernmental Panel on Climate Change (IPCC) emissions scenario that appears to be most accepted across the globe, sea levels will rise 22 feet by the year 3000.
The researchers from Vrije Universiteit Brussel, Manchester Metropolitan University and the Université catholique de Louvain are the first climate scientists to admit the inevitability of sea level rise at an ever accelerating rate to due the intransigence of most countries in adopting any form of emissions containment that might make a difference and the impossibility of even the most austere emissions measure to reverse an inevitable result. [emphasis mine]
Here's the chart from that research, showing the sea level rise to which we are already committed, if we emitted zero CO2 from today on. To this baseline add on top the results of all of the current and future emissions of CO2 and manmade greenhouse gases, plus methane outgassing from melting permafrost, undersea methane deposits, fracking, swamps, dam discharges, etc to get actual future sea level rise.