Scientists know that the internal forces that generate Earth’s magnetic field can change and that the strength of the field oscillates over time. That doesn’t mean they’re responsible for climate change
connects the Laschamps excursion to climate upheaval, extinction events, and even changes to human behavior. The scientists hypothesized that during a time when Earth’s magnetic field was weaker than normal, increased solar and cosmic radiation was able to penetrate Earth’s atmosphere, altering ozone levels and driving global climate shifts and extinctions.
For Buis the key takeaway is that, “There’s no evidence that Earth’s climate has been significantly impacted by the last three magnetic field excursions, nor by any excursion event within at least the last 2.8 million years.” During a pole reversal, Earth’s magnetic north and south poles swap locations. This happens on average every 300,000 years or so, but the last flip occurred around 780,000 years ago, according to.
“There's no evidence that links magnetic changes to climate when we've seen big magnetic reversals or near reversals in the paleoclimate record,” says Schmidt. “There's no climate change that goes with them, there's no mass extinction that goes with them.” Deep ocean sediment samples revealed significant climate change around 66.3 million years ago, says Johnson. But this also coincides with a large volcanic eruption in India called the Deccan volcanism, which produced some of the longest lava flows on Earth.
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