"Natural building" is increasingly used worldwide to connote the simple and ultra low carbon systems that human beings have used for thousands of years - and are now reviving, usually with a few modern touches. Since you generally can't find much clay or straw or unmilled timber in cities, we also call it "rural".

See the Products page for building products currently for sale, and meeting some standard of "green". Here we look at manmade items, like plastic bottles, concrete rubble, and shipping containers that can be effectively repurposed as components of new buildings, but aren't owned or promoted by commercial interests, and have no clear place in building codes.