US measured temperature data (blue below) shows that we have been cooling for nearly a century. But the temperatures reported by NCDC (red below) show the opposite, that the US is warming.
The animation below shows the change from the thermometer data, to the fake data which NCDC releases to the public.
They accomplish this transition by an impressive 1.6 degrees of data tampering, which cools the past and warms the present. Their hockey stick of adjustments is shown below.
Note the sharp rise in data tampering shown in the graph above. This is largely due to just making up data. Since 1990, they have been losing station data exponentially, shown below. When they don’t have data for a particular month, they just make modeled temperatures up for that station, and infill the missing data with imaginary temperatures.
The amount of fake data is currently 40%, and if trends continue, nearly all of their data will be fake by the year 2020.