I’d think you could build some machine to (re)harvest nitrogen from the air and it would eventually be free. But maybe that doesn’t exist / super hard to do…
Or you could just run a pipe from the building’s furnace or generator exhaust to the pig-gassing room and use the CO2 your facility is already generating.
I’d think you could build some machine to (re)harvest nitrogen from the air and it would eventually be free. But maybe that doesn’t exist / super hard to do…
Or you could just run a pipe from the building’s furnace or generator exhaust to the pig-gassing room and use the CO2 your facility is already generating.