I mean, I think it’s a distinction without a difference, is the problem - yes, the biosphere exchanges material with the rest of the ball of mud, but that, for all intents and purposes, is a closed system, and so things like its ability to draw down carbon, or dilute pollutants, or break down plastics, are constrained beyond where we apparently thought they were. Per the notion of landfill mining, that also puts constraints on how effective we can be there - how much energy we can commit to that, what level of wastage or side effects we can accept. We’ve had a philosophy that all problems will be solved in the future by technological developments, but our timelines don’t seem to be lining up right now.
Ecosystems have _finite capacity_ to cope with what we throw at them (and still be useful to us in the broadest sense).
The qualification in parens is just there to take care of the objection that no matter how hard we try, we won't be able to eradicate all life on earth with current technology. But we can make life pretty miserable for humans with current technology.
The benefit to us doesn't have to be in any monetary sense. Just the satisfaction of knowing there's a beautiful forest would count.
