Excessive pumping of groundwater is causing the geology under the city to collapse, according to a new study using satellite imagery that reveals parts of Beijing – particularly its central business district – are subsiding each year by as much as 11 centimetres, or more than four inches.
The authors of the study warn that continued subsidence poses a safety threat to the city of more than 2o million, with “a strong impact on train operations” one of the predictions.

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