"Continuous sea-level rise is something we cannot avoid unless global temperatures go down again," said climate scientist Anders Levermann from the Postdam Institute for Climate Impact Research. "Thus we can be absolutely certain that we need to adapt. Sea-level rise might be slow on time scales on which we elect governments, but it is inevitable and therefore highly relevant for almost everything we build along our coastlines, for many generations to come."
Anders Levermann was taking about the implications of a new study he is a co-author of - The multi-millennial sea-level commitment of global warming. The study is published in the Proceedings of the National Academy of Sciences online during July 2013. It is one of the first studies to combine analyses of four major contributors to potential sea level rise into a collective estimate, and compare it with evidence of past sea-level responses to global temperature changes.
The result is a longterm estimate that global sea levels will rise about 2.3 meters, or more than seven feet, over the next two thousand years for every degree (Celsius) the planet warms. "the total sea-level commitment after 2,000 y is quasi-linear, with a sensitivity of 2.3 m °C" reports the study.
"The study did not seek to estimate how much the planet will warm, or how rapidly sea levels will rise," noted Professor Peter Clark, an Oregon State University paleo-climatologist and co-author on the PNAS article. "Instead, we were trying to pin down the 'sea-level commitment' of global warming on a multi-millennial time scale. In other words, how much would sea levels rise over long periods of time for each degree the planet warms and holds that warmth?"