Speaking of this, my amateur ass had an idea for a shelved sci-fi book where two people traveling through alternate dimensions ends up during one chapterin a world where the rich have fled theirs through dimensional travel. The idea of that world is that the remaining people on Earth fight to survive as the rich left behind devices that every so often go off and ends up destroying their natural or man-made structures and their farms too.

All of why this happened would be explained in a later episode where they find the rich people who explain they left because the resources on the planet dried up and they couldn't make any money off of a planet without resources.