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Predictions based upon the sudden and sharp temperature increase called Global warming (sharpest temperature increase in terra history): the Arctic Ocean may be ice free as soon as 2050 - earliest possible date. Would that cause a massive rise in oceans? No. The melted water would only replace the missing ice. However by 2100, cruise ships would be routinely calling on Canadian and Russian resort ports - and the sun never sets during the entire two week cruise.
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