Rather than blowing agents, this insulation uses growing agents. It's natural. It's made with agricultural waste and fungi. You can grow it in place. No hydrocarbons are involved, and it yields little to no toxic waste. Compared to most other insulation materials, it takes little energy to make the stuff (low embodied energyEnergy that goes into making a product; includes energy required for growth, extraction, and transportation of the raw material as well as manufacture, packaging, and transportation of the finished product. Embodied energy is often used to measure ecological cost.). Indoor air quality is likely to be better, too.
Wow! If you're looking for a super green insulation, mushroom insulation could be for you... if you can wait a bit longer.