Briffa’s trees showed this inconvenient drop in temperatures after 1940, which didn’t suit the hockey stick product requirements which Mikey had been tasked with.
Briffa’s trees showed the same post-1940 drop as the 1975 NCAR and National Academy of Sciences’ graphs, as shown below.
The next graph shows the NCAR temperatures overlaid on Briffa’s trees. Almost perfect!
But that didn’t suit the product requirements which Jimmy and Mikey were working on, so Jimmy created a new surface temperature record which didn’t look anything like the National Academy of Sciences or NCAR records, while Mikey chopped down Briffa’s trees and spliced on Jimmy’s new surface temperature record.
Presto! A hockey stick which had nothing to do with reality. Just what the doctors ordered.
Too bad the IPCC wasn’t so clever in 1990.