Fidel. I think that it is obvious that expanding human population is the cause of desertification. It stands to reason that whenever an increased human population puts more stress on a piece of land it will likely turn into a desert, and whenever people leave a piece of land, that will take the pressure off, and the land will bloom again.
Hazel. But then how do you explain the desertification of hillside terraces in Yemen, which happened after the population radically decreased in that area? And how do you explain the fact that the Kano area in Nigeria supports enormous numbers of people without turning the area into a desert?
If Fidel's theory of desertification is correct, what would you expect to happen in Yemen? What would you expect in the Kano area?
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