Q.R. Quasar's poem is about the uncomfortable idea that every one of us, and perhaps our whole species, is already on a list of things that will one day disappear. The speaker starts casually, almost like someone gossiping ("hey!—didn't you know?"), but the repetition of "the extinction list" at the end of nearly every stanza gradually feels like a drumbeat.
The speaker's feeling shifts from offhand dread to real fear. The "real horror" arrives when the mind is "turned upside down" and the blood runs "colder and colder." What unsettles the speaker most is how ordinary this fate is: we are marked in a "humdrumeveryday death zone," not dramatically but quietly, like a notch on a stick. The ending is bleak. Once no one is left to read the poem, we will have been "deleted," and nobody will miss us. The mood is chilly, darkly sardonic, and haunted by being forgotten.