ref Sky News
Downtown Chicago is "sinking" due to "subsurface heat islands" or underground climate change, US scientists have warned in a study.
For the first time, experts at Northwestern University in Illinois have linked the phenomenon to shifting land under urban areas.
As the ground heats up, layers of clay also deform and this causes the foundations of buildings and the surrounding land to move excessively and even crack, the scientists said.
This could affect the long-term durability of buildings, they claimed
he problem is not confined to Chicago, as the experts state the "silent hazard" is lurking underneath other cities around the world. .Read more of the above intro
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