Tehran, Iran, is sinking at a dramatic rate, as much as 25 centimeters in some regions, according to a study of satellite images scheduled to be published in Remote Sensing of Environment. Groundwater loss due to population growth, dams and drought is behind the subsidence rate that is among the world's highest, and researchers are concerned the land won't be able to recover.
Subsidence rate in Tehran, Iran, among world's highest
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