Inside Climate News: "Global warming could drive pulses of ice sheet retreat reaching 2,000 feet per day." A 2023 studyof the seafloor near the coast of northern Norway brings an ominous warning...showing that some of the planet’s ice sheets retreated in pulses of nearly 2,000 feet per day as the oceans warmed at the end of the last glacial period. The international researchers measured + mapped 'corrugation ridges' arrayed across 11,000 square miles of seabed. The ridges, produced by 2 daily tidal cycles per day, are generally under 8 ft in height but spaced from 80 to an astonishing 1,000 ft apart. As in the graphic, "they were formed about 20,000 years ago, as the retreating ice sheet moved up and down with tidal rhythms, floating free at high tide and pushing sediments into a ridge at the point where the ice meets the seafloor at every low tide." This is scarily up to 20 times faster than anything previously measured, except for a similar study by 'Eric Rignot, a glaciologist at the University of California, Irvine and Caltech’s Jet Propulsion Laboratory, who was not involved in the new research but has measured accelerating ice sheet retreat around Antarctica with his own research.' Lead author 'Christine Batchelor of the Scandinavian study, a geophysicist and marine geology researcher at the University of Newcastle states the rate of retreat occurred in daily or monthly pulses, which shows that ice sheets respond to global warming in a non-linear way. Currently global models project about 1.5" of sea level rise per decade, thus 12" by 2050, but during past geological intervals of rapid warming, there’s evidence of sea level increasing at a rate of up to 20 inches per decade during episodes of rapid ice sheet disintegration. Eric Rignot sums it up: “During the time period when these events were recorded, sea level was rising 4 meters (13 feet) per century.” This is the sort of study that keeps climate scientists up at night.