Update: I’ve now added the speliothem data sent to me by Charles earlier in the week.
Guest Post by Charles Duncan
The claim is often made that the rate of temperature change the Earth has experienced over the last 40 years is ‘unprecedented’, and is therefore likely to be man-made.
|Warming rate Std Dev, °C/ century||
Maximum warming rate, °C/century
Start year, AD
|End year, AD||
Start anomaly (temp), °C
End anomaly (temp), °C
Of course, ice core data is proxy data, and therefore based on assumptions, some of which may not be valid. However the Met Office’s Central England Record, the longest continuous instrumental temperature record (going back to 1659) shows that even within these recent times the current rate of warming is unremarkable:
Update: As promised in comments – added speliothem dat: