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^^^I am not sure exactly, but it was a full ecological breakdown during the dustbowl. There were more things that happened scientifically than losing major aquifers and lack of rainfall. I think it was use of fertilizer that was in the run off which killed off a significant portion of certain animals and insects vital to keeping the "structure" of the soil. Continuous use of these items without replenishment or crop rotations, eventually cause crop growth failure essentially making the soil turn into sand. That is why ADM and Monsanto and Dupont make some of their products.
The dustbowl was a human ecological disaster.
The damage seen in Hurricane Katrina, a natural disaster, was due to a lack of ecological and infrastructural maintenance.
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