[lttlrck]

Concrete isn't sustainable - trees are.

The cement industry is one of the biggest producers of CO2 - trees capture CO2.

https://en.m.wikipedia.org/wiki/Environmental_impact_of_conc...

Supply issue has nothing to do with the raw materials. This is not the way.

[gigatexal]

Ok I agree on the trees.

But if 3D printing can make homes easier to build and cheaper then perhaps we can build more and help increase supply lowering housing prices.