I’m not a scientist by any stretch, but would disposing of plastics with these mushrooms in a terrarium of sorts help? They would have to be big and numerous.

The mushrooms would break down the plastics into CO2 and water and the plants would absorb the CO2 and water. As the plastics start to go away, we could add more of our excess plastic to keep the cycle going.

If this works, it also keeps the plastic eating mushrooms contained and away from all the essential plastics we have today.