Yup
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Closing of Panamanian seaway?
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Oooooh, good one. That was arguably more impactful, at least in terms of also contributing to massive climate change.
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It's not unfair to say that. At least as far as I know.
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There were pretty major faunal turnovers at the Eo-Oligo boundary coupled with significant marine extinctions. Tied to global cooling?
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And the closing of the isthmus of Panama. I could change to "one of the" or "Quaternary" instead of Cenozoic.
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Extinction only event? Other candidates: African Humid Period greening of Sahara, prehistoric ag., or Colonial introductions to start.
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I'm thinking prehistoric, global.
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You've got much smarter followers than me, but I say no: It was the post-1492 global transformation.
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I'm thinking earlier than that--I guess "premodern" or "prehistoric" would have been better to say.
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