Will sinkholes swallow China’s cities?
For some of China’s urbanites, smog, congestion and lack of pedestrian infrastructure are the least of their problems. CityMetric reports that in more than 50 Chinese cities, chunks of land large enough to swallow a home or car have suddenly given way. The phenomenon, known as “subsidence,” has caused buildings to tilt and roads to become unpassable.
The problem appears to be mostly self-inflicted. According to the article, the main explanation is over-extraction of groundwater. When too much water is removed from beneath urban areas, the soil can shift, triggering an occasional collapse. Mining and oil extraction also are to blame, along with naturally occurring soil erosion. Click here for CityMetric’s photo compilation of examples of subsidence throughout China.