claim: Fifty-five thousand years ago the whole world was 2°C warmer than it is today[ ... ]
evidence: During the LGM 22,000 YBP the average summer temperature was 3–5 °C ( 5–9 °F ) degrees cooler than today, with variations of 2.9 °C ( 5.2 °F ) degrees cooler on the Seward Peninsula to 7.5 °C ( 13.5 °F ) cooler in the Yukon.