In 1999, NASA reported 0.6C warming from 1882 to 1996. Now they report almost twice that much warming from 1882 to 1996. Note that the alterations have been far outside of the green error bars, indicating incompetence, fraud, or both.
1991 Figure 1: Global annual-mean surface air temperature change based on the meteorological station network.
2015 Version: traditional analysis using only meteorological station data
The next graph shows the same thing, normalized to 1880’s temperatures.
This is the biggest fraud in science history, and needs to be investigated by Congress immediately.