It's Ok. I think he missed a better opportunity.
CO2 (Carbon Dioxide) is a colorless, odorless gas produced by burning carbon and organic compounds and by respiration. It is naturally present in air (about 0.03 percent) and is absorbed by plants in photosynthesis. It's just kinda there.
Now.... CO (Chris Olave / Carbon Monoxide) is harmful when breathed because it displaces oxygen in the blood and deprives the heart, brain and other vital organs of oxygen. Large amounts of CO can overcome you in minutes without warning — causing you to lose consciousness and suffocate. It's a silent killer!
Would you rather be known as an inert gas, or as a silent, lethal killer?