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No, there are many deserts far older than human agriculture. Humans are reponsible for some desertification, but often that's just making existing deserts worse

• flukus 10y ago
  > Having endured arid or semi-arid conditions for roughly 55–80 million years, the Namib may be the oldest desert in the world[1][3] Wow. Just to put that in perspective, it was a desert when North America was still joined to Europe, India wasn't and Australia was an Antarctic appendage: http://www.bobspixels.com/kaibab.org/geology/gc065mya.htm http://www.bobspixels.com/kaibab.org/geology/gc065mya.htm