I feel like carbon monoxide would be so much more humane too. I used to work a job where we had to vigilantly check for CO because it could kill a whole family

I feel like carbon monoxide would be so much more humane too. I used to work a job where we had to vigilantly check for CO because it could kill a whole family without anyone realizing they were in danger. 1200 parts per million is fatal. Pump like 2500 PPM of CO into the chamber to be sure, everything dies, no suffering needed.