Is it possible for a creature to become a gas bomb during decomposure?

I have this idea of homicidal alien beings that upon death (after their body ceases living and begins to decompose) release enough poisonous gas into earth's atmosphere to wipe out all life on the planet. In the novel-in-progress, the younger of the aliens uses this to provide justification for her murdering the townspeople, saying that if she and her father (the other alien being) die, they will wipe out life on earth, three times over.

Is it possible to fit enough gas to wipe out a planet into into two human-sized beings?

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Is it possible for a creature to become a gas bomb during decomposure?

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