## Land Subsidence Threatens Millions in China's Cities
A new study reveals a concerning trend of land subsidence in China's urban areas, putting millions of residents at risk. Researchers estimate that nearly a third of China's urban population could be affected by sinking land, with coastal cities facing a particularly dire situation.
The study, published in the journal 'Science', analyzed satellite data from 82 Chinese cities, including major metropolises like Shanghai and Beijing. The findings indicate that 45% of the urban land area studied is sinking, with 16% experiencing rapid subsidence exceeding 10 millimeters per year.
Hotspots of subsidence include Beijing and the coastal city of Tianjin. The researchers estimate that 270 million urban residents could be affected, with nearly 70 million experiencing rapid subsidence. This alarming trend is primarily driven by human activities in cities, such as excessive groundwater withdrawal, which lowers the water table.
The study also highlights the combined threat of land subsidence and sea-level rise. Researchers predict that China's urban area below sea level could triple by 2120, potentially affecting 55 to 128 million residents. This could have catastrophic consequences without a strong societal response.
The researchers emphasize the importance of accurately measuring land subsidence and incorporating these measurements into adaptation and resilience plans. Failure to account for sinking land could lead to significant destruction of lives and infrastructure in the coming decades.
The study underscores the urgent need to address land subsidence in China's urban areas. Implementing sustainable water management practices, reducing reliance on groundwater, and developing comprehensive adaptation strategies are crucial steps to mitigate the risks associated with this growing problem.