Arbuscular mycorrhizal (AM) fungal networks are vast underground systems that form symbiotic relationships with the majority of Earth's plant species, exchanging water and nutrients for plant-fixed carbon. A recent global mapping effort revealed these living infrastructures possess a total length of approximately 110 quadrillion kilometers and a mass of roughly 300 megatons of carbon.
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https://www.sflorg.com/2026/06/bio06142602.html