Dr James Hansen of NASA has a lot to do with the high-profile media concerns (and related public concerns) regarding climate change. In 1988, he authored a study that outlined the purported risks of global warming. More about that another time.
In 1999 NASA published his work relating to the long-term temperature change within the USA and globally. The data are still available on the NASA website:
In 2016 NASA re-published the data. But with significant adjustments. The data now align with their narrative of rapid warming. The updated graph has lowered the warmth of the 1930s and 40s to meet their preferred message of ongoing increasing temperatures from the 1990s.
NASA has changed their historic temperature record to fit the supposed increase in recent temperatures!