Well god bless good intentions, and it's a cool idea, but it seems better-suited to the first world than the third. None of the naysayers have yet mentioned th

Well god bless good intentions, and it's a cool idea, but it seems better-suited to the first world than the third. None of the naysayers have yet mentioned the fact that concrete (especially its ingredient Portland cement) is one of the most energy- and greenhouse-gas-intensive building materials available. (It's made by baking certain minerals in an oven at high temperature.) We who live in large, energy-intensive houses would actually do better for the environment, and for global housing inequity, by living outdoors and in improvised huts of natural materials, rather than trying to get the people who are doing it right to come "up" to an Austin, TX standard of living. But nobody wants to hear that kind of idea. Therefore, we wait until nature imposes that solution on us.