I just added a section on earthbag construction to my Natural Building lens. Earthbag was first developed by the military to build temporary shelter or to protect against flood water, but was developed into a way to build permanent structers in the 1980’s. Just like it sounds, it involves filling bags with earth and stacking them to create walls. Strands of barbed wire between the layers, and the plaster on the outside, hold the bags in place.
I found a great video on youtube about a project in Nepal where they are educating people on the affordability of building an earthbag house, so that even people in need can own their own home.