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Beneath the surface of forests, grasslands and farms, vast fungal webs form underground trading systems to exchange nutrients with plant roots, acting as critical climate regulators as they draw down 13 billion tons of carbon annually. 

Beneath the surface of forests, grasslands and farms across the world, vast fungal webs form underground trading systems to exchange nutrients with plant roots, acting as critical climate regulators as they draw down 13 billion tons of carbon annually. Yet until recently, these "mycorrhizal networks" were greatly underestimated: seen as merely helpful companions to plants...