A bit of elaboration. Many varieties of fungus are capable of cleaning up the environment in ways that other forms of life can only dream of. Some can even break down plastics/oils, including the delicious oyster mushrooms (most widely cultivated mushroom on the planet). Also:>Mushrooms release spores>Spores serve as a food source for insects>Insects attract birds>Birds bring seeds>Seeds prosper in fungus-prepared, nutrient-rich soil>Eventually, massive trees are able to "network" and share nutrients through mycelial mesh>Big trees make a lot of dead wood that falls to the ground, feeding the same fungi that started all this
Fungi are smart. They play the long game. Plant the fungus, and the forest will become inevitable.