Arms race of humanity will be transferred to the Moon where artificial intelligence will provide and conduct new experiments and evolution of arms. All of the weapon armies will destroy each other without any participation of a human. Then the special Moon dust - the result of this arms race evolution - accidentally delivered to Earth will lead to a total destruction of all mechanisms and machines and high technological achievements, but won't touch any human or a live being. The Humanity will return to an early pre-industrial era.
Lem, Stanisław, Elinor Ford, and Michael Kandel. 1994. Peace on Earth. New York: Harcourt Brace.