I like hempcrete or hemp lime which is a mixture of hemp hurds with lime and sand. It's poured in place or made into bricks. However, the bricks also need cemen

I like hempcrete or hemp lime which is a mixture of hemp hurds with lime and sand. It's poured in place or made into bricks. However, the bricks also need cement for structural integrity, so it's best to pour it in place. One needs wooden framing to sustain the walls. I don't think it's scalable to build tall buildings using it but for regular houses it's perfect because it also has good insulation, vapour and thermal buffering characteristics. We probably need something with enough structural integrity to be able to at least 3D print houses. The architects can then create a 3D model which is fed to a printing crane and printed in place.