6000 years ago is 1,500 years before the Great Pyramids were built. Hard to believe man could have much of an impact that far back.
It would put the Ussher Bible just about right....
But it is not hard to believe that GOD had a great impact at that time! This was when He set up the Garden of Eden and breathed life into Adam and Eve. After the fall, they were expelled from Eden and GOD cursed the ground, so that would be another climate impact.
Wait until the alarmist say about climate change when the Tribulation starts. Maranatha
Well, it was a subtle change back then. But, 1,500 years later, when the Egyptians started flying around in airplanes, it really took off.