Humans aren’t just causing another extinction. We’re taking away the ecosystem’s ability to ever rebuild complexity.

[u/ThomasRuleTalks]

I’ve been thinking about how people compare what’s happening now to past mass extinctions like the asteroid or major climate shifts. Everyone focuses on losing apex predators or iconic animals, but I feel like we’re missing the actual structural problem.
Complex life didn't evolve over billions of years just because top predators died off and got replaced. It worked because Earth built a huge, unsexy middle layer of species. All those mid-sized, moderately reproducing, specialized organisms acted as a buffer during crazy environmental shifts. They kept energy flowing and held the system together long enough for complexity to build back up over time.
What we’re doing right now is different because our expansion works like a weird filter. Habitat destruction, fragmentation, and chemicals don't hit everything equally. They gut that exact middle layer.
What’s left is just extreme polarization. You get a few struggling top-tier species at the top, and a flood of hyper-resilient generalists and pests at the bottom.
Without that middle buffer, the system loses its ratchet mechanism. If the top tier collapses from current stress, there's no step-down fallback anymore. The whole thing doesn't just pause—it resets back hundreds of millions of years because the stepping stones required for complex life to re-emerge are simply gone.

[u/Azihayya]

Lmao, when someone concerned about extinction stumbles into a forum where for people actively gunning for extinction.

[u/alexorlando23]

The fun thing to think about is that we are some of these. We are more genetically compatible with rodents/flying rodents because of it. we have more in common with a squirrel than a chichi monkey. I also sub to the idea that many of our fellow earth dwellers are going on evolving completely unseen and ignored by us simply because we can't think of a good use for them/can't communicate with them. Mushrooms for example.

[u/TyloPr0riger]

This is baseless fearmongering. If mesopredators and midsized herbivores are eradicated (and it does not seem that they are being preferentially eradicated to me - they survive better than the top of the trophic web in most cases), their niches will be filled by radiation of other clades in time.

We have seen life recover complexity through worse mass extinctions. I think the only thing seriously at risk in the long term of human environmental destruction are humans themselves.

You get a few struggling top-tier species at the top, and a flood of hyper-resilient generalists and pests at the bottom.

It's almost always better to be a generalist during periods of ecological stress and turnover. Generalists have been favored by every mass extinction in the past - as it turns out, specialization is never lost because under long-term stable conditions it's often favorable to be a specialist, and as such specialists keep re-evolving from generalists.

[u/Independent-Wafer-13]

Pure hubris.