'They'd' better hurry.


B.C to 1859 - Strong, stable magnetic field

1859 -2010 - 15% field loss

2017 to present - accelerating field loss


Toba Event ~ 72,000 years ago

Vostok Event ~ 60,000 years ago

Laschamp Event ~ 46,000 years ago

Mono Lake Event ~ 35,000 years ago

Lake Mungo Event ~ 24,000 years ago

Gothenberg Event ~ 12,000 years ago

Now?


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