Can nature heal itself?

Extinction removes something no recovery process can put back

Question: Can nature heal itself?
Position‹2 of 3›: No Nature cannot heal itself
Argument1 of 2›: Extinction removes something no recovery process can put back

The argument

Proponents of this position begin from the one loss that is unambiguously final. A species that is gone is gone, and no amount of time, protection or regrowth returns it. Proponents argue that this matters more than a tally of names, because species are not interchangeable units. A pollinator shaped to a particular flower, a predator that regulated the populations it fed on, a disperser whose gut and range carried heavy seeds to new ground: each performed work the rest of the system was organised around, and its disappearance leaves that work undone. The argument is that the consequences continue after the loss itself. A plant whose only effective disperser is gone may persist as standing adults for a long time while its seeds fall beneath it and nothing carries them further, so a population that looks intact is already failing. A system without its regulating predator produces outbreaks of what that predator ate, which changes the vegetation, which changes everything depending on the vegetation. Proponents add that habitat already lost commits further extinctions before they occur, since populations left in fragments too small to sustain them die out over subsequent generations, which means the damage already done is not yet fully expressed. Holders of the view conclude that the vocabulary of healing misdescribes what is possible here. A wound closes because tissue is replaced by tissue of the same kind. These losses are of particular evolved lineages, assembled over spans that cannot be repeated, and vegetation growing back over the ground they occupied is not the same thing as their return. Proponents argue that what nature can do unaided is arrive at some new and simpler arrangement, and that calling this healing confuses the growth of something with the recovery of what was there.

Premises

[P1]An extinct species cannot be recovered by any natural process, and species are not interchangeable in the functions they perform. [P2] The loss of a specialised pollinator, predator or disperser leaves functions unperformed, with consequences that continue to unfold after the loss itself. [P3] Habitat already fragmented commits further extinctions in subsequent generations, so the damage done is not yet fully expressed. [C] Nature cannot heal itself in the sense the question intends, because the central losses are irreversible and regrowth is not their repair.

Counter-arguments

Critics argue that the position establishes something narrower than it claims. That extinctions are irreversible is not in dispute, but what follows is that recovery cannot be a return to a previous state, not that recovery is impossible. Ecosystems have always lost and gained species, functions are frequently taken up by other organisms, and a system reorganised around different members can be diverse and stable. They also object that the argument, read as practical guidance, points nowhere, since if the losses are final then intervention cannot undo them either, which makes the position a case for preventing further damage rather than an answer about healing.

Rejecting the premises

[Rejecting P2] Functions left unperformed are frequently taken up by other organisms, so the consequences of a loss need not continue to accumulate as the premise suggests. [Rejecting C] Irreversibility shows that recovery cannot restore a previous state rather than that recovery is impossible, and intervention cannot reverse extinction either, so the conclusion does not favour repair over recovery.