> in the natural world, species sometimes end up moving from place to place I think the difference here is the small scale for time and the large scale for spa

> in the natural world, species sometimes end up moving from place to place I think the difference here is the small scale for time and the large scale for space. With humans moving these animals around the planet and mixing ecosystems you end up forcing competition that reduces overall biodiversity. A great example is "outdoor cats" - they're brought in by people and end up endangering the local small fauna. It's not "bad" if you like cats and don't like birds, but it leads to less species overall and I think that's the main concern. > that’s just humans trying to impose order on the more dynamic natural world I'd argue in this case nature is less dynamic and slow moving, we're causing the disruption - not failing to handle a natural change.