Welcome to the 85th Daily Field Note! Here you find the top post of the day, one covering each scientific field that is included by Geopolis. Since these authors put a lot of effort in writing a good post they surely deserve the extra exposure.

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Science quote of the day:
"If our brains were simple enough for us to understand them, we'd be so simple that we couldn't." ~ Ian Stewart

Geology: Geology and Civilization Part 3: Ploughed Away

Original post by @mountainwashere

Last time, I talked about how water is our most precious resource- today I'm going to talk about #2, and it's not oil. It's dirt. And we're running out. It seems like a bizarre claim to make to say that we're running out of dirt- after all, most of the land on the planet is covered by dirt, right? Well, yes. So I should narrow it down a bit: We're running out of fertile topsoil that can be used for farming. Since the founding of America, over 50% of its total arable topsoil has been lost. Between the Second World War and the fall of the Berlin Wall, farmland equivalent to a third of all farmland in use today has been abandoned due to topsoil decay. We can even phrase it as a historical law: When a society runs out of fertile topsoil, it must either expand its exploitation to new topsoil or collapse.

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