Compressed earth blocks diminish deforestation and energy intensive housing material (kiln fired bricks and cement). They are not a new concept but a group called Faith Tech Connect have come up with a machine that can crank out these bricks real quick. An important difference between these houses and the concrete block houses that fell down in Haiti is the addition of chicken wire on the inside and outside that provides tension to prevent shearing and a base for the stucco. Also the block in Haiti can break in your hand. It is very cheap.