This is a good question. I’m not aware of any EA-related investigations of this area.
Generally, when I’ve read articles and papers on this topic (which have ranged from “very alarmed” to “mildly concerned, but pushing back on alarm”), I’ve had a hard time figuring out where humans come in.
I worry about climate change and crop disease and soil degredation and other things that could damage our food supply, but the extinction of not-very-populous species, or the deterioration of a forest where no food is grown and few people visit, seems… bad, but not nearly as directly threatening as the issues EA usually thinks about. And it’s hard to imagine ecosystem shifts making the lives of wild animals too much worse than they already are.
Did the report you’ve linked have any particular theories about the ways in which these changes will affect humans? Which parts of our civilization are at risk?
Yes, we may be losing things that are precious and beautiful, and robbing our children of their natural heritage, but are people going to starve or get sick or otherwise suffer harms deeper than disappointment and wistful regret? Those are bad, but many other things seem to be equally disappointing and regrettable to people; the environment (save for climate change X-risk) seems not to have been especially “sticky” as a thing people care about.
(I’m not trying to argue against the importance of biodiversity/ecosystem health; I’m just genuinely uncertain about the main risk/source of negative impact.)