Earth’s last major warm period was as hot as today

At peak of previous interglacial interval, sea levels were 6 to 9 meters higher

sea level map

HISTORIC HEAT  Sea levels were 6 to 9 meters higher than present-day levels the last time Earth’s climate was this warm, new research suggests. Similar sea level rise today would submerge many coastal areas (red).

John C. Kostelnick (data), GSFC/NASA (visualization)

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