Since the 1970s, we’ve been told CO2 is the villain that causes most climate change. NOAA obliterated that with a graph.
“The amount of CO2 in the atmosphere today is comparable to around 4.3 million years ago when sea level was about 75 ft higher than today, the average temp was 7 degrees F higher than in pre-industrial times, & large forests occupied areas of the Arctic that are now tundra,” NOAA reports.
So, there were no people, the sea level was higher, and there were forests on the now-frozen tundra.

