Pioneer Labs engineers a bioplastic bacterium to run on Martian regolith, water and air

The engineering, as DeBenedictis describes it, sits on the input side. She said the idea is that "you can go to Mars, and you can feed it dirt, water and air, and use it to build bioplastic houses for astronauts" ^[11]. The output side is a habit the parent organism already has. She said Cupriavidus necator "naturally produces bioplastic kind of for the same reason that when you eat too many doughnuts, you put on weight in your hips" ^[13].

Everything here comes from one interview with the company's chief executive, published by Scientific American. The interview text does not include yield, growth rate or test conditions, and it does not say how the strain copes with Martian cold or radiation. "Adapted to Martian conditions" is Scientific American's description of the strain ^[1]. The adaptation DeBenedictis describes is the ability to use nutrients in regolith, water and processed atmosphere ^[9]. A mission planner would want to know how much plastic a given mass of regolith produces.

DeBenedictis called the strain "a useful and safe thing for us to send to Mars and to use to prepare for the first human mission" ^[12].

Scientific American describes terraforming as a distant and deeply speculative prospect beset by enormous scientific and engineering challenges ^[5]. In our view sPL.001 is evidence about building materials and says little about terraforming. The company's name points to the larger idea: pioneer species rebuild ecosystems after eruptions and fires one step at a time ^[7]. A plastic-making bacterium for pressurised habitats is a first step in that sequence only if later strains extend it. DeBenedictis described sPL.001 as "the very first of several" and said the company has plans for four more ^[4].