claim: Global average temperatures over land have plummeted by more than 1C since the middle of this year – their biggest and steepest fall on record.
evidence: In the Paleocene, with a global average temperature of about 24–25 °C ( 75–77 °F ), compared to 14 °C ( 57 °F ) in more recent times, the Earth had a greenhouse climate without permanent ice sheets at the poles, like the preceding Mesozoic.