By Paul Homewood
Last month, NOAA caused a lot of controversy by adjusting historic global temperature data to show that the pause had never happened. This has been well covered by WUWT and others, but what is less well known is that NOAA have been making similar but subtle adjustments year by year for a while now.
When they do this, the old versions are never archived, and they do not publically announce what they have done. Instead, the new figures simply replace the old version.
Fortunately, however, Walter Dnes has been archiving the old data each month since January 2010. His results were published at WUWT last week.
I have used his data to show in a simple fashion what the total effect of these changes since 2009 has been.
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