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Ah, I just realized you may have been asking if 100 species' extinction for clearcutting a few thousand hectares of North American old growth was an overestimation.
No, it's actually very conservative. "Ghost with Trembling Wings" is a recent nonfiction book on the topic of the Anthropocene aka Sixth Mass Extinction, which is our current biosphere era.
The main point, though, is that a tree farm is not a forest. It has <1% of the biodiversity.
Without denying anything you're saying here, I thought your "hundreds of species" was hyperbole when Canadian forests are to be considered. A different thing would be the Amazonian Basin.
I share your concerns and yet applaud tree farming: a small area produces the same as a great extension of natural forest, which is left alone.
In my country there's a lot of tree farming in areas where there weren't trees for thousands of years, increasing biodiversity. Natural forests and real biodiversity are at risk because of agriculture, not tree farming.