? Assuming you meant to reply to me, I think this is orthogonal to what I posted
ETA since we seem to have reached maximum comment depth: To clarify, the context suggests you mean to disagree with me, but I don't see any incompatibility between your comment and mine. These examples are not bringing back species that are currently extinct. That is not to say that life is not adaptable or that vacated ecological niches will not eventually be re-filled. Judging from the paleontological record, they definitely will -- sometimes rapidly and sometimes not for many Myr. Sometimes, due to convergent evolution, the replacements for a given niche are shockingly close in appearance to the extinct originals, but it's never quite the same as before.
I think the only thing I actually disagree with here is the apparent (implied?) suggestion that folks concerned about climate change are in a state of "hysteria." The climate scientists I know would be among the first to agree that we don't know everything!
ETA since we seem to have reached maximum comment depth: To clarify, the context suggests you mean to disagree with me, but I don't see any incompatibility between your comment and mine. These examples are not bringing back species that are currently extinct. That is not to say that life is not adaptable or that vacated ecological niches will not eventually be re-filled. Judging from the paleontological record, they definitely will -- sometimes rapidly and sometimes not for many Myr. Sometimes, due to convergent evolution, the replacements for a given niche are shockingly close in appearance to the extinct originals, but it's never quite the same as before.
I think the only thing I actually disagree with here is the apparent (implied?) suggestion that folks concerned about climate change are in a state of "hysteria." The climate scientists I know would be among the first to agree that we don't know everything!