To make bricks, companies have to heat clay at 2,000 degrees Fahrenheit for several days on end. As you'd imagine, that produces a lot of carbon emissions. According to the EPA, making bricks accounts for 8% of global emissions.
Ginger Krieg Dosier and Michael Dosier started to wonder why we can't make bricks the way coral reefs make strucural formations that withstand erosion. Thus BioMason was born. In 2012, the company started to produce bricks made of sand and bacteria that completely negate carbon emissions. The process also recycles the water it uses to make the bricks.
Every bricks starts with sand packed into rectangular molds. The molds are then inoculated with bacteria, which wrap themselves around the grains of sand. With each bacteria covered grain of sand acting as a nucleus, calcium carbonate crystals begin to form around it. An irrigation system feeds the bricks nutrient rich water over the course of several days to facilitate the process. The crystals grow larger and larger, filling in the gaps between the grains of sand. After three to five days, the bricks are ready for use.