Between hellish natural disasters; the domino effect of chemical spills, fires, and even nuclear leaks; and the transcendence of millions, the population of the world is vastly reduced. Governments struggle to maintain control and to rebuild in the aftermath of the upheaval, while most of the population grapples with understanding what has occurred.
—"The Return Of Quetzalcoatl - Post-Apocalypse," The End of the World: Wrath Of The Gods
Firecrackers are usually fairly safe when used responsibly. Not so much when their efficiency is improved by orders of magnitude thanks to an inch-thick layer of SCP-248.
Humanity persists, ironically spared from the cold produced by the atmospheric dust cloud by the heat still emanating from the crater that was once Eastern Europe.
Shall we decimate them? That sounds good. A nice word, decimate.