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A peer-reviewed study showed that the Laschamp geomagnetic excursion triggered abrupt climate change and a mass extinction 41,000 years ago when the Neanderthals vanished. 12,000 years ago, during the Younger Dryas, another geomagnetic excursion — the Gothenburg — brought climate chaos and extinction again. The 8.2-kiloyear event, the Sahara’s...

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