I think the limiting factor, and I just had to refresh on this, is that the existing soils have no organic matter in them now, so nothing to help one grow even with water. Maybe erosion, and stream channels can uncover some fertile Nile-like soils, but unlikely soon.
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what may be key is the kind of brush and grasses and flowers that can stabilize sand dunes, like happened with the west of san francisco
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What is your lifespan ?
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I wonder what the net effect would be given how the Sahara acts as a big source of phosphorous for the amazon... potential for unintended consequences.. (source: https://www.nasa.gov/content/goddard/nasa-satellite-reveals-how-much-saharan-dust-feeds-amazon-s-plants …)
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