[Question] Literature On Existential Risk From Atmospheric Contamination?

I’m researching the possibility of global atmospheric contamination as a potential existential risk (say via the deliberate release of some extremely toxic chemical which achieves global dispersion [cf. microplastics for evidence this is possible], etc.), and have been having trouble finding any literature talking about the topic that isn’t specifically about either nuclear winter or volcanic eruptions. Anyone know of any relevant literature, or at least have advice on what keywords I should be using to learn more?

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