NOAA/CRU/NASA/Muller have wiped out the 1940-1970 cooling, but the historical record shows that their hockey sticks are complete crap.
In 1940, the Arctic was rapidly melting. Greenland glaciers were “nearing a catastrophe”
The Arctic had warmed six degrees, and sea ice had thinned dramatically
By the early, 1970’s, the arctic had cooled dramatically, glaciers and sea ice were expanding.
NOAA/CRU/NASA/Muller have erased the post-1940 cooling, just like they said they were going to do in their private E-mails.