I vote for better building materials with lower total carbon footprint - lighter, renewable, durable, safe, cheap, etc. we need to improve both energy efficienc

I vote for better building materials with lower total carbon footprint - lighter, renewable, durable, safe, cheap, etc. we need to improve both energy efficiency of homes, cost to build, and time to build. New materials and methods could go a l0ng way toward helping emerging economies and poorer Americans alike build better housing.