Philip Ross works with a mushroom farm called Far West Fungi. And on it they're growing your future house. Or at least the nontoxic, fireproof, mold- and water-resistant building blocks for it.
Imagine concrete that's two-thirds granulated plastic, but is as strong as the stuff currently in use. Architect/engineer Henry Miller figured out how to make it, not just on paper, but in a couple of real-life structures.