There’s more fresh water hidden below Earth’s surface in underground aquifers than any other source besides the ice sheets. That groundwater plays a critical role for rivers worldwide. But in recent decades humans have pumped trillions of gallons out of those underground reservoirs, resulting in a “slow desiccation” of thousands of river ecosystems worldwide.

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https://www.nationalgeographic.com/science/2019/10/groundwater-pumping-killing-rivers-streams/

Source: IAH