In fact, recent research by Blancon et al published in Nature in 2009, examining the paleoclimate record, shows sea-level rises of 3 metres in 50 years due to the rapid melting of ice sheets 123, 000 years ago in the Eemian, when the energyimbalance in the climate system was less than that to which we are now subjecting the planet.
In more recent years, however, a new set of ocean monitors has documented a decrease in the rate of oceanic heating for the same time period that satellite-based monitoring systems have shown an expanding imbalance between incoming and outgoing energy flows.