The first global map of underground fungal networks reveals a hidden 68 quadrillion-mile superhighway that helps sustain life on Earth and store carbon in the soil. The first global map of underground fungal networks reveals a hidden 68 quadrillion-mile superhighway that helps sustain life on Earth and store carbon in the soil. Beneath forests, grasslands, wetlands, and even many agricultural fields lies a vast ... [7891 chars]