Here's a link - http://www.carrollquigley.net/pdf/Tragedy_and_Hope.pdf - to a free .pdf of a famous (and extraordinarily long) book written by Carroll Quigley which was published in the mid-1960s. Quigley was a Harvard graduate, historian and professor. Much more about his life is at this wiki page: https://en.wikipedia.org/wiki/Carroll_Quigley

In Tragedy and Hope he detailed when and who dreamed-up the man-made global warming hoax and why it was conceived (which was to unite the world against a common threat, which they knew was nonsense).