Cities are sinking as they guzzle groundwater, and oil and gas, from below
Rising seas threaten to consume the coastal areas of major metropolises around the world. Now those risks are compounded by an accelerating danger: Most of those cities are also sinking.
The study shows that in Jakarta, the dense Indonesian capital that’s teeming with an estimated 11 million people, land subsided nearly 15 times as fast as global mean sea-level rise between 2015 and 2020—making it one of the fastest-sinking cities on Earth. In addition to Jakarta, four other cities in Asia—Chittagong, Bangladesh; Tianjin, China; Manila in the Philippines; and Karachi, Pakistan—are all rapidly subsiding, putting a combined 59 million people at risk of increased flooding and related impacts. In Tianjin, a major port city near Beijing, maximum subsidence rates are almost 20 times greater than mean sea level rise.
Other measures have been costly and ineffective, in part because they don’t account for the role subsidence plays.
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