Earlier quoted context omitted.
From the article it sounds like invasive species, plus the fact that we have royally screwed up the local ecosystem. For instance — white-tailed deer are growing exponentially, eating all the underbrush and outcompeting other animals, and they have no/few natural predators left. I agree that not much has changed since the 80s, I think it's just catching up to us now.
White-tailed deer have only recently recovered from over-hunting and returned to their pre-colonization population levels.[1] Do you have a source that frames their growth as exponential? 1. https://en.wikipedia.org/wiki/White-tailed_deer#Population_a...
We're at 3x the total population that existed when europeans started settling here, and without an appropriate way to cull the herd I don't see that changing. We have milder winters (so no starvation), less interest in hunting, and again a lack of natural predators.