I was thinking of some of the problems involved with increasing the tech level of a planet that was pre-industrial. And one of the things you need are nitrates.
You need them for gunpowder (and later explosives). You need the to make various acids (theey act as a catlyst in creating sulfuric acid, and an ingredient in nitric acid).
And I caught myself thinking "if the planet will support human life, you'll have nitrates coming out of your asss..."
And then it hit me that that statement was *literally* true...
Oy.
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