New paper finds Greenland was 2–3°C warmer than today 4000 years ago — Paper published in Quaternary Science Reviews
Study 'finds west Greenland was '2–3°C warmer than today' from 6,000 to 4,000 years ago & 'summer temperatures were warmer than present by at least 7,100 years ago.' The local Greenland Ice Sheet margin was most retracted behind its present position between 6,000 & 5,000 years ago'...indicates Greenland was significantly warmer than present several times over past 8,000 years despite 'safe' levels of CO2'