Reminds me of speaking with a local resource management professional who was advocating for a certain set of behaviors and processes on our place to "restore the land to its historic condition". When I asked whether she meant 1810, or 1510, or 12,000BC she did not have an answer. But between the climatic variations, changes in apex predators, invasive species, (plants, insects, and animals), it struck me then, and now, as a terribly wooly concept on her part. I'm all for not degrading the land, and improving the ecological stability and diversity of local species, especially in the face of forced changes, but using a fundamentally unknowable point as a target, uh, no thanks.
All the best,
Peter