Normally I focus on data tampering and fraud by NASA and NOAA, but there is another big problem. Their surface temperature data itself is garbage.
There are very few stations with long term records in South America, but one of them is the Mendoza, Argentina airport. That thermometer shows more than 1.5C warming since 1979, but satellite temperatures at that location show very little warming.
Surface and satellite temperatures are diverging there at a rate of almost three degrees per century.
The thermometer is located at an airport on the edge of a large urban area.
Mendoza appears to be warming, but it has nothing to do with climate.
Policy is being driven by bad data and bad data practices, emanating from fake scientists at government agencies.