An international research team has produced the first complete global map of the vast mycorrhizal fungal network, a discovery published in the journal Science. These underground filaments, known as hyphae, form symbiotic relationships with approximately 70 percent of all plant species, exchanging nutrients and water for carbon. The study utilized machine learning and data from 16,000 soil samples to estimate the network's immense scale, calculating a total length of 110 quadrillion kilometers. This subterranean system contains roughly 300 megatons of carbon biomass and sequesters about 4 billion metric tons of carbon dioxide annually, accounting for 11 percent of human-caused emissions. However, researchers warned that agricultural soils contain only half the fungal density found in natural ecosystems. They specifically highlighted that rapidly converting grasslands into farmland threatens these vital networks, potentially reducing the Earth's capacity to store carbon and recycle nutrients.