T. Heller. Chapter 3 – Is the NASA Surface Temperature Record an Accurate Representation? Evidence-Based Climate Science (Second Edition)
Data Opposing CO2 Emissions as the Primary Source of Global Warming2016, pp.49-59.
It is widely accepted that there has been about 1.5°C surface temperature warming across the planet since about 1880, and this is causing polar ice to melt and an increase in the frequency of hot days. Multiple data sets from NOAA, NASA, and CRU show approximately the same behavior.
However, earlier versions of the same data sets from the same organizations showed much less historical warming. Historical data has been systematically altered over the past 15 years to cool past temperatures and increase more recent temperatures. The amount of warming from 1880 to 2000 is now shown by NASA as double what was shown in 2001. Going back further to the 1975 National Academy of Sciences report, we see a completely different story—where all 1900–40 warming was lost by 1970.
This chapter shows evidence of data tampering, historical obfuscation, and collusion—to reach the current consensus among the small group of people who control this critical data. It also shows that periods of Arctic/glacial melting are cyclical and have been seen in the recent past.