Scientists Tracked US Freshwater for Decades—One Finding Raised Alarm
Summary
Scientists used satellite data to study freshwater stored underground in the southwestern United States. They found that important underground water sources, called aquifers, are being drained faster than they can refill, which could threaten farming and food production in that region.Key Facts
- NASA scientists led a study that tracked changes in water stored on and under land worldwide from 2002 to 2025.
- Aquifers in the U.S. Southwest are losing water faster than they recharge.
- This loss risks the future of farming, rural economies, and the availability of food in these areas.
- Human activities, especially irrigation and pumping groundwater, are main causes of this water loss.
- The study used satellites to measure tiny shifts in Earth’s gravity that show changes in water storage.
- The new method allows scientists to see exactly where water depletion is happening in the aquifers.
- Groundwater pumping for agriculture had a stronger impact on water loss than climate factors like changes in rainfall.
- Continued water loss may force farmers to dig deeper and more expensive wells to get water.
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