The Ruhr Valley in Germany has been mined for coal for 170 years. Over that time, they took so much material out from underground that the surface sank, and now the valley is completely dependent on Emschergenossenschaft pumps to keep the area from flooding. The most surprising thing about the pump system is that the coal companies are paying for them! That wouldn't happen in Kentucky, where coal companies fold the minute they are held to account. Tom Scott has the story.
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