A new study in Nature: Geoscience suggests that current estimates of sea-level rise in response to global warming are too low. Rohling et al. utilize a “combination of a continuous high-resolution sea-level record, based on the stable oxygen isotopes of planktonic foraminifera from the central Red Sea and age constraints from coral data to estimate rates of sea-level change” during the last ice age (124-119 kyr). Their findings indicate in a climate 2 degrees C warmer than the present the oceans were 4-6m higher than the present. Overall, sea-level increased by 1.6m per century. An important factor contributing to this rise was the melting of the Greenland ice sheet.
A 1.6 m global sea-level rise per century would correspond to disappearance of an ice sheet the size of Greenland in roughly four centuries (modelling suggests 1,000 years or more).
The research supports the often criticized, unconventionally high, estimates of 0.5-1.5m sea level rise predicted by AD 2100. The good news? More deep sea!