thinking we could reliably plan and run them when we don’t even know most species involved in them
This argument seems symmetric to me. If you support decreasing biodiversity, you’re claiming that we can reliably decrease it. If you support increasing diversity, you’re claiming that we can reliably increase it. So the parent comment and OP are both making the same assumption—that it’s possible in principle to reliably affect biodiversity one way or the other. (Which I think is true—we have a pretty good sense that certain activities affect biodiversity, eg cutting down rainforests decreases it.)
We can reliably increase and decrease biodiversity, though not necessarily control the magnitude of change. That’s not the argument I was replying to—rather, that we could create curated ecosystems that would do what we expected them to (edit: which I think is false and dangerous).
This argument seems symmetric to me. If you support decreasing biodiversity, you’re claiming that we can reliably decrease it. If you support increasing diversity, you’re claiming that we can reliably increase it. So the parent comment and OP are both making the same assumption—that it’s possible in principle to reliably affect biodiversity one way or the other. (Which I think is true—we have a pretty good sense that certain activities affect biodiversity, eg cutting down rainforests decreases it.)
We can reliably increase and decrease biodiversity, though not necessarily control the magnitude of change. That’s not the argument I was replying to—rather, that we could create curated ecosystems that would do what we expected them to (edit: which I think is false and dangerous).