Humans spur worst extinctions since dinosaurs

One can't help but notice a headline like that: "Humans spur worst extinctions since dinosaurs" - it might even bring one out of a blogging hiatus. You can read the full U.N. report in various languages, but the summary is that, "[i]n effect, we are currently responsible for the sixth major extinction event in the history of earth." We? Who, me? Wowsers. Considering how brief a time humans have been around in that earth history, we should be pretty proud of ourselves to make such a blip on the ole' radar! Hoo-hah.

But really, why does biodiversity matter?
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