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Graham Hancock dedicates at least 10% of his most recent book "Fingerprints of the Gods" to exploring the recent evidence for a cataclysmic meteor impact that catalyzed the precipitous drop in global temperatures we observe 12900 years ago at the "Younger Dryas Boundary." https://en.wikipedia.org/wiki/Younger_Dryas#Impact_hypothesi...

He has some pretty out there theories but that section is pretty convincing.

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My understanding is the duration does not really line up with an impact event also the starting periods don't seem to line up correctly. "In Western Europe and Greenland, the Younger Dryas is a well-defined synchronous cool period.[34] Cooling in the tropical North Atlantic may, however, have preceded it by a few hundred years; South America shows a less well-defined initiation but a sharp termination."

Which is what I find annoying about pet theories in books, you can make plenty of things seem convincing by leaving out other evidence.

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