[mckeed]

This story features part of the world going Black Mirror at the same time as another part goes (arguably) White Mirror:

Manna – Two Views of Humanity's Future by Marshall Brain https://marshallbrain.com/manna1

[joe__f]

Sounds like The Time Machine (from your description, I didn't read the article)

[thealchemistdev]

It's a short story. Highly recommended.