In 1950, everyone knew about the massive warming in the Arctic

Even NASA/NOAA knew about it until a few years ago, when they decided to erase it.

GHCN V3 : Data.GISS: GISS Surface Temperature Analysis

GHCN V2 : Data.GISS: GISS Surface Temperature Analysis

In order to get rid of the 1940’s blip, NASA/NOAA cooled temperatures by more than 2C