The ground beneath your feet is not quiescent. It zings and pulses with frenzied activity, much of it driven by a partnership between plants and fungi that dates back at least 450 million years. This is the mycorrhizal network – a vast system of fungal filaments locked in a mutual exchange with the plant life that carpets our planet, transporting nutrients from the soil and receiving in return the carbon produced by plant photosynthesis . It's large, and it's vital. Around 70 percent of all