i bet humans would be 8x buffer if we could fix atmospheric nitrogen
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It's very expensive in energetic terms so most organisms don't do it Mostly just unicellular fellas Some plants have symbiotic relationships with N fixers around their roots, piping them sugar in exchange for fixed nitrogen
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Soil rich in fixed nitrogen is nice for plants and lots of fertilizer functions by increasing bioavailable N Historically we got this from stuff like urine and especially mining giant piles of guano in caves in Argentina, and by mining mummies in Egypt
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