I don’t want to spoil Cat’s Cradle by Kurt Vonnegut for you, but it might be what you’re looking for (even though the end and aftermath aren’t exactly depicted, you sorta see them coming).
No, the rest of the world is fine. Plants, animals, etc are unaffected. It’s just humans (and why is never explained, which makes it bad for sf).
Shucks! Well, it still fits into the thread.