As of 1999, temperatures were going the wrong direction for 70 years, and something had to be done about it.
James Hansen and USHCN fixed this in 2000, and made temperatures do what they were supposed to do.
After the adjustment, 1934 and 1998 got relatively shifted by 0.7C. A move which would make Bernie Madoff jealous.
So how did they do this? Mainly by adding on to post 1960 temperatures, as seen below.
Tree rings didn’t agree with the phony adjustments, and didn’t show any increase in temperatures after 1960. So Michael Mann had to step in with his nature trick. He replaced the tree ring data post 1960 with the adjusted thermometer data. Then he blamed his and Hansen’s junk science on CO2 affecting the trees.
And this doesn’t even address getting rid of the MWP ….
I’m sure that all these simultaneous manipulations going on ten years ago were completely unrelated, because we now know that the hockey team never communicated or exchanged e-mails.