Back to journals from 16th century settlers, in the area which is now South Carolina and Georgia, there were vast orange groves. I believe that orange grove "line" is now somewhere down into Florida.
Not to mention the WWII planes buried under 260 feet of ice in Greenland....
Everything moves in cycles, which involves TIME.
TIME is beyond the comprehension of most humans.
To tell someone that a cycle may last for a couple hundred years causes them to yawn and move on.
For example, the Sun has a 22 year sunspot cycle, the North Atlantic Ocean Basin has a 30 year heating cycle, and the Northern Pacific Ocean Basin has a heating Cycle that is longer and more complex than the Atlantic.
Combining all these cycles, and unknown variables produces uncertainty for a long TIME prediction, and an educated guess for a short TIME prediction.
Each of these cycles are based on a set of assumptions that are tested against observations, the assumptions are revised, re-tested, etc, etc.
When tree rings, glacial moraines, sediments in lakes and Oceans are sampled and age dated we can begin to piece together the past.
The problem is that the impatience of an over eager non-scientist to jump to a conclusion without rigorous testing and re-testing produces a junk science which can achieve a cult status, such as we have today with “Global Warming.”
Back in the “Red Earth People” day the North Atlantic was so warm that they routinely traveled by water inside the Arctic Circle across waterways that are now coved by permanent Sea Ice.
As I said, 5,000 years ago was as warm as it got, and gradually, in small cycles, the Earth’s Atmosphere has been getting colder.
The good news is that there has never been a successful experiment that demonstrates a cause and effect relationship between the concentration of CO2 in the atmosphere and the temperature change of the atmosphere.
Hence, my FRiends, drink all the carbonated juvenile adult beverages that you want, and free yourselves of any guilt that the Libs might throw your way!
BTW, water vapor is our most abundant Green House Gas at 25, 000 parts per Million.
CO2 is only 400 +/- parts per Million.