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Not depressing at all, just a logical and necessary adaptation of humans living in desert environments. In places like NJ which get 40 or 50 inches of rain in a year, the water production of a unit of land is more than sufficient to support normal human life and activities on that unit of land. In the arid west, where annual precipitation is 4, 8, or 10 inches per year, it can take the water production of 5 to 10 times a unit of land to support normal human life and activity on a unit of land. Originally it was about agricultural land uses, but no less true today in urban environments.
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