Legend Rock is a cliff face over 800 yards long. It is carved with nearly 300 images scattered along its length. They are petroglyphs that archaeologists now believe range in date from about 11,000 years ago to perhaps the mid-19th century.And yet the earliest images don't mention global warming...
I remember reading a series of scifi books with this as the theme. They were by Matthew Reilly “Area 7”, Steve Alten “Domain”, and Robert Doherty “Area 51”. They did a good job coming up a story plot to fit with all the ancient sites of power and early ruins of civilaztion. They are fun reads if you get the chance.
Actually, looking at the thread’s title the first time my initial thought was: “Oh look, another thread of Keynesian economic theory.”