Makes sense to me 
Long and short of desertifications is that if you chop down a rainforest (which have very fertile but very thin soil), it turns to desert. If you overfarm an arid area it turns to desert.
See, the environmentalists do have a point about many things kids.
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"If you believe in the existence of fairies at the bottom of the garden you are deemed fit for the bin. If you believe in parthenogenesis, ascension, transubstantiation and all the rest of it you are deemed fit to govern the country." - Jonathan Meades
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