Humans might be causing it. Its definitely not CO2 though... If anything, CO2 is helping. I'd look at over usage of aquifers and falling water tables, monoculture farming, and pesticides - weird how they'll blame everything except those
What that guy said ☝️
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Aquifers and water tables I'm ignorant of
just underground water fed by precipitation
Yeah. But you can make better use of precipitation by not letting is run away in temporary streams. Ponds, swales, leaf cover. You could think of it as the efficiency of water duration or something like that.