Earth Building Workshop hosted by the Mussey Grade Foundation in 2012: hands on training in building an earth bag dwelling/emergency shelter with natural low-cost materials. (Photo courtesy Mussey Grade Foundation)

Earth Building Workshop hosted by the Mussey Grade Foundation in 2012: hands on training in building an earth bag dwelling/emergency shelter with natural low-cost materials. (Photo courtesy Mussey Grade Foundation)

Earth Building Workshop hosted by the Mussey Grade Foundation in 2012: hands on training in building an earth bag dwelling/emergency shelter with natural low-cost materials. (Photo courtesy Mussey Grade Foundation)