A meteor hit the earth around 10,000 BC it was huge...causing tidal waves throughout the earth and quakes...it took 200 years for the atmosphere to clear up. It took out Atlantis and what humans, enosh etc that were left migrated into the Egypt area. That was about the only place that the atmosphere was livable.
Alas, all it did was bust up the residual ice sheet in Canada and that flooded the St. Lawrence (and its extended estuary) with ice, and that changed the climate briefly in the Northern part of the Northern hemisphere.
Southern Temperate latitudes, subtropical and tropical areas, as well as everything in the Southern hemisphere weren't bothered at all.
Egypt was "NOTHING" until the Sahara dried up. At that time folks moved closer to the river bringing with them their already existing civilized skills, but that's all many thousands of years later than the statues and carvings we are looking at in this article were created.
One of the major cyclical deals archaeologists have been watching for now is the appearance and disappearance of the Sahara on a regular basis. Just about every 100,000 years the axis tilts just so and the Atlantic monsoons are pulled in and the Sahara flourishes. Then, the axis slowly tilts back, and the Sahara dries up. The Potsdam Institute has studied the matter extensively and says the Sahara pluvial lasts about 5,000 years at a time. They believe this answers the question regarding how the predecessors to the Neanderthals got to Europe 400,000 years ago ~ and, that answer is "they swam" or "drifted on vegetative mats" at the narrow points. Some of us would like for them to say "boats" but if "they" can get those folks across the Mediterranean on rafts, and it works, that's OK I suppose. I was hoping for early "Evinrude" technology.