How The Sahara Desert Was Made

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One Response to How The Sahara Desert Was Made

  1. alfy says:

    Wow. What a story. I was too quick to remind you of Phil’s original question without reading deskarati further ahead. This seems to answer it definitively. Such an excellent exposition, avoiding the “talking heads” I always complain about. The various experts were so good, explaining the ideas as they were formulating as they actively showed us the nature of the evidence they had found.
    They also provided us with a stunning piece of evidence about the route or time of entry of Homo sapiens into Europe.
    Perhaps the biggest surprise was the astronomical basis of the climatic change and the sheer speed of the transition from lush green to desert in two centuries. I want to draw a parallel with two other topics. We know that ice cold glacials alternate with warm interstadials, but just how quickly does this happen? Similarly, the polarity of the earth’s magnetic field is subject to reversals on a regular basis, but how long does the reversal take, and what uncertainties occur at this time?
    Congratulations, Jim, on finding this post. It is one of the best things we have seen on deskarati.

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