The world’s biggest cities are sinking. Is yours one of them?

Global cities are subsiding by up to several inches a year, an exhaustive new survey shows

一項覆蓋全球465個百萬人口城市的研究發現，地面下沈是普遍存在的全球性城市問題，主要驅動因素是地下水抽取。東京、北京等地通過限制開採和改用地表水已成功遏制下沈，說明多數地方仍有時間應對。