The Arctic Ocean has had ice on it, in some form, for essentially the entire span of recognisably modern human existence. The most recent interglacial period warm enough to have melted the summer ice cap was the Eemian, approximately 130,000 to 115,000 years ago, during which paleoclimate evidence suggests the Arctic was seasonally ice-free at its summer minimum — most clearly during the warmest phase around 130,000 years ago, with conditions gradually cooling toward the end…
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Source spacedaily.com
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