My take on this is that the ice caps have melted many times in the past .
*"University of Florida geochemist Andrea Dutton and her colleagues traveled halfway around the world and peered 125,000 years back in time to find clues about how melting polar ice sheets in the future could impact coastal cities in the U.S.
What they discovered from the fossil record on the islands of Seychelles, an Indian Ocean archipelago nation 900 miles off the coast of eastern Africa, could sound a clarion call for those cities. The fossils showed that much of the coastal lands were underwater, triggered by a rise in sea level caused mostly by a collapse of the Antarctic ice sheets."*
The rest of the story…