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Humanity’s challenge of the century: Conserving Earth’s freshwater systems by Saul Elbein on 10 May 2021 Many dryland cities like Los Angeles, Cairo and Tehran have already outstripped natural water recharge, but are expected to continue growing, resulting in a deepening arid urban water crisis. According to NASA’s GRACE mission, 19 key freshwater basins, including several in the U.S., are being unsustainably depleted, with some near collapse; much of the water is used indiscriminately by industrial agribusiness. Many desert cities, including Tripoli, Phoenix and Los Angeles, are sustained by water brought from other basins by hydro megaprojects that are aging and susceptible to collapse, while the desalination plants that water Persian Gulf cities come at a high economic cost with serious salt pollution.

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