Mexico City points to hemisphere at risk

Always short of water, Mexico City keeps drilling deeper for more, weakening the ancient clay lake beds on which the Aztecs first built much of the city, causing it to crumble even further.

The world has a lot invested in crowded capitals like this one, with vast numbers of people, huge economies and the stability of a hemisphere at risk.

Source: New York Times
https://www.nytimes.com/interactive/2017/02/17/world/americas/mexico-city-sinking.html