Agreed, although we already have a significant amount of petroleum based products in modern (US, anyway) homes: insulation (more and more styrofoam), sealing wr

Agreed, although we already have a significant amount of petroleum based products in modern (US, anyway) homes: insulation (more and more styrofoam), sealing wraps, glues over fasteners, flooring, and plumbing. Your basic plywood by weight is a large part resins already, although no idea the makeup. Maybe automation will make more "organic" building materials more affordable or feasible.