This reminded me of hydrogen sulfide H2S[1] which then caused me to go back a look and sure enough, the book "Under a Green Sky" [2] was about runaway H2S and e

This reminded me of hydrogen sulfide H2S[1] which then caused me to go back a look and sure enough, the book "Under a Green Sky" [2] was about runaway H2S and extinction events. [1] https://en.wikipedia.org/wiki/Hydrogen_sulfide https://en.wikipedia.org/wiki/Hydrogen_sulfide [2] https://orionmagazine.org/review/under-a-green-sky/ https://orionmagazine.org/review/under-a-green-sky/ and https://vimeo.com/64407973 https://vimeo.com/64407973