> So why not switch to nitrogen asphyxiation instead? Is it that much more expensive? Food grade gasses (for brewers, at least) seem to put N2 as much cheaper.

> So why not switch to nitrogen asphyxiation instead? Is it that much more expensive? Food grade gasses (for brewers, at least) seem to put N2 as much cheaper. And that makes sense, it's aggressively abundant in the atmosphere. Concentrating it feels like it should be easy. But I wonder if there's a safety aspect. If you're handling these gasses, you know if you're in a high CO2 area. Your blood acidity climbs and everything in your body tells you to get to better air. And it's rapid so you still have oxygenated tissues. In a nitrogen environment, you slowly deplete your reserves, faint and die. Maybe they could spike it with an odour like they do methane.