Subsidence

August 22, 2015, 11am PDT
Parts of the nation's food basket, the San Joaquin Valley in California, are sinking at two inches per month, not per year. Known as subsidence, it results from over-pumping of groundwater by farmers desperate to save their crops in the epic drought.
NPR
June 7, 2013, 1pm PDT
Shanghai and the Pudong District in particular have seen unprecedented development over the past 25 years. The soil the city is built upon, however, has begun to subside recently.
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