Dr. Owen Geiger did an article on the recycled plastic blocks in Mother Earth News. http://www.motherearthnews.com/hands-on-and-how-to/recycled-plastic-block-houses.aspx He put the same article up on his Earthbag blog http://earthbagbuilding.wordpress.com/
If the name Dr. Owen Geiger sounds familiar it’s because it should be. His passion and expertise is sustainable housing. http://www.motherearthnews.com/Green-Homes-Expert-Owen-Geiger.aspx http://www.grisb.org/