History Of How The Hockey Stick Was Manufactured
There wasn’t any hockey stick prior to the year 2000.
The 1990 IPCC report showed that temperatures were much cooler than 800 years ago.
Steve then details, with graphs, the original IPCC graph showing the MWP and the LIA (See image) followed by Briffa's tree proxies; 1975 NAS report; NCAR graph; USHCN daily temperature data; GISS graph; etc etc
Hansen getting rid of the 1910-1940 warm period gave Mann cover to claim that something was wrong with Briffa’s trees – and throw them out. This opened the door for the creation of hockey stick.
Once the flood gates opened, they went nuts – erasing the MWP and LIA, erasing the 1930s and jacking up recent temperatures. All over the world, the past got cooler and the present got warmer.
Real Science concludes:
And now we have this completely manufactured temperature trend. The spike that we see is indeed Mann-made, and Hansen-made.
See all at Real Science.