A teaspoon of soil holds more microbes than there are people on Earth.

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According to the Natural Resources Conservation Service (USDA), a single teaspoon of fertile, living topsoil contains between 100 million and 1 billion individual bacteria, alongside yards of fungal hyphae, protozoa, and nematodes—a population exceeding the total human population living on Earth today. These soil microbiomes drive global carbon cycling and nutrient replenishment.

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