VIENNA: Human activity risks contaminating pristine water locked underground for millennia and long thought impervious to pollution, said a study Tuesday that warned of a looming threat to the crucial resource.
Even at depths of more than 250 meters (820 feet) under the Earth's surface, so-called "fossil" groundwater—more than 12,000 years old—has been found to contain traces of present-day rainwater, they said.
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