Warning: Full spoilers for Avengers: Endgame follow…
Losing half of the world’s population, including wildlife and other elements that would be absolutely crucial to ecosystems and the environment as a whole, is a catastrophe for sure. No one would argue this. Except for possibly Thanos, but even he’d have to admit that, despite new opportunities for progress, it’d all be a super bummer. Sacrifice galore.
After our remaining heroes in Avengers: Endgame learn the Infinity Stones are gone, and that there’s no way (discovered yet) to bring back everyone who’s been erased, the story jumps us five years into the forlorn future where the world is still in a stark and uncomfortable grieving period.
Source: IGN.com 5 Consequences of Endgame You Didn't Even Consider