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I am not sure that armadillo's fart CO2 (carbon dioxide), I may be wrong, but like most critters they fart hydrogen sulfide (CH4). That is a little different from CO2.

CO2 is good and essential for plants to live. CH4? It stinks (hell it is a fart), and is pretty flammable.

Am I a chemist? No, just used to light my farts when I was in the Corps for laughs. I also fart CH4 more so now that I am up in age. Lots of fiber in my diet.