Cultivating mushrooms produces a lot of waste. For every kilogram of mushrooms produced, about three kilograms of soil-like material containing straw, manure and peat is left behind. In the EU, this results in more than 3 billion kilograms of waste per year.
Click here for original story, Mushroom cultivation produces three times its weight in waste. It’s now being turned into burgers and fertiliser
Source: Phys.org