In 1979, NOAA and the NSF said global cooling since WWII was indisputable, it was about half a degree C, it was causing droughts and floods, it would probably turn back into warming, and the swings were due to natural variability rather than climate change.
There is a record of such variability ever since man made observations.
Lawrence Journal-World – Google News Archive Search
Facts didn’t suit the White House agenda to seize control of the global energy supply, so Gavin Schmidt at NASA simply erased the post-WWII cooling.