Discovery Channel, amongst many other outlets, has a recent piece on Greensulate, “eco-friendly” building insulation using mushroom spores.

It writes…

Insulation made with mushroom spores could eventually replace the familiar pink synthetic foam used by many homeowners to pad their attics and walls. Although excellent insulators, traditional polystyrene and polyurethane foam blends require petroleum, are expensive to produce, and are not biodegradable. The patented Greensulate formula is an organic, fire-retardant board made of water, flour, minerals and mushroom spores. It not only hinders heat flow but could also be modified to produce sustainable, “growable” homes.