It's a bacterium in this case, not a fungus. It can metabolize hydrogen and use CO2 to build the proteins. They electrolyze water using solar power to create th

It's a bacterium in this case, not a fungus. It can metabolize hydrogen and use CO2 to build the proteins. They electrolyze water using solar power to create the hydrogen, so it sort of does happen on thin air, but of course some minerals need to be added as well. The product is basically a powder consisting of dried bacteria.