This is FACT I have also studied this issue and NASA-GISS under James E. Hansen setup this system of the distortion of data to promote their cause; this is not science!
I’ve written often how NASA and NOAA have corrupted the US temperature record to rid it of that inconvenient 1930s warmth, but their efforts to wipe out the warm past extend far beyond President Obama’s 57 US states.
They have done even more damage to the Northern Hemisphere temperature record since the 1975 National Academy of Sciences report. The animation below flashes between 1975 National Academy of Sciences temperatures and 2014 GISS temperatures.
From: Tom Wigley <wigley@ucar.edu>
To: Phil Jones <p.jones@uea.ac.uk>
Subject: 1940s
Date: Sun, 27 Sep 2009 23:25:38 -0600
Cc: Ben Santer <santer1@llnl.gov>It would be good to remove at least part of the 1940s blip, but we are still left with “why the blip”.
1975 NAS Report (Temperature graph on page 148)
data.giss.nasa.gov/gistemp/tabledata_v3/ZonAnn.Ts+dSST.txt
Centinel2012 