SidWatching a documentary about fungi because the air quality is orange again. Trees are connected by a vast network of fungal mycelium. The plants share photosynthesized sugars with the fungus and the fungi break down soil nutrients to give to the plants.
Through this fungal network, trees can protect each other. If there's a tree under attack by pests or stress, they can share nutrients through the mycelium network and help the tree heal.
70% of the carbon plants take in, they put underground. Fungal mycelium are instrumental in carbon sequestration. The stabilized carbon can stay there in the ground indefinitely.