Billions of people rely on a valuable underground resource that’s rapidly declining in certain areas, study says
Many parts of the world are experiencing a rapid depletion in the subterranean reserves of water that billions of people rely on for drinking, irrigation and other uses, according to new research that analyzed millions of groundwater level measurements from 170,000 wells in more than 40 countries.
It’s the first study to piece together what’s happening to groundwater levels at a global scale, according to the researchers involved, and will help scientists better understand what impact humans are having on this valuable underground resource, either through overuse or indirectly by changes in rainfall linked to climate change.
Groundwater, contained within cracks and pores in permeable bodies of rock known as aquifers, is a lifeline for people especially in parts of the world where rainfall and surface water are scarce, such as northwest India and the southwest United States. Reductions in groundwater can make it harder for people to access freshwater to drink or to irrigate crops and can result in land subsidence.
“This study was driven by curiosity. We wanted to better understand the state of global groundwater by wrangling millions of groundwater level measurements,” said co-lead author Debra Perrone, an associate professor in University of California’s Santa Barbara’s Environmental Studies Program, in a news release on the study that published in the journal Nature on Wednesday.
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