by Diamond et al. 2021, Apr 27, 2023 in NoTricksZone
During the last interglacial (LIG) 127 to 119k years ago, when CO2 levels were said to be only 275 ppm, Greenland’s Camp Century surface was ice free, vegetated. Today this same site is buried under a 1.4 kilometers-high ice sheet.
The Arctic was sea ice free during the LIG (Diamond et al., 2021).