Interesting question and I suspect difficult to get a sensible answer to. I am assuming that you expect the 20th Century warming period to continue to raise Northern hemisphere temperatures to the levels experienced around 1,000 years ago. Certainly we know that Greenland had a lot less ice then - although we do not know where that water was. I am not sure if we have any information from Northern Canada or Asia. Regretfully I have not heard about any useful data from the South. Was the sea level higher a thousand years ago? Even extrapolating from coastal site evidence might not help as many land masses were still (and are still) rising gently following the last ice age.
There is not a lot of evidence that sea levels are rising substantially at the moment - you had best ask an oceanographer - I would stick with the science rather than ask a "climatologist".
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Interesting question and I suspect difficult to get a sensible answer to. I am assuming that you expect the 20th Century warming period to continue to raise Northern hemisphere temperatures to the levels experienced around 1,000 years ago. Certainly we know that Greenland had a lot less ice then - although we do not know where that water was. I am not sure if we have any information from Northern Canada or Asia. Regretfully I have not heard about any useful data from the South. Was the sea level higher a thousand years ago? Even extrapolating from coastal site evidence might not help as many land masses were still (and are still) rising gently following the last ice age.
There is not a lot of evidence that sea levels are rising substantially at the moment - you had best ask an oceanographer - I would stick with the science rather than ask a "climatologist".