The Partisan Divide on Issues

[Bob Butler 54]

(04-22-2020, 04:53 PM)pbrower2a Wrote: You have your times mixed up; the Ice Age is well attested; the "Green Sahara" is shown to have happened when the sunreached its most northerly point on the ecliptic was closer to the perigee (summers were hotter and shorter in the northern hemisphere, so the summer rains got farther north, but winters were colder and longer, so Mediterranean storms dipped further south in the winter). During the coldest parts of the Ice Age, sea levels were lower -- but there were no large cities.

I have also heard that that the time when the Sahara went from green lands to desert also coincided with the wide spread use of slash and burn agriculture by the humans.  Yep.  More greenhouse gasses.  Less land dedicated to forests.  The Sahara may have been the first casualty of human climate change.  

One temple of ancient Egypt shows palm trees, abundant greenery, abundant African wildlife, all growing within close proximity of the core Nile civilization.  Some are saying this was literal, was not any kind of fantasy.  The fall of the first wave of civilizations in the core of the Middle East corresponds to this period, when some of the best land for the development of human civilization went dry, when the action shifted to the north side of the Mediterranean.