Volcanism.
This comes from one of Bran's grandmother's tales, where she talks of one winter which had a night that lasted for a generation.
Somewhere on this planet is something like the Deccan or Siberian Traps. When they're quiet, it's summer, when they're active, winter sets in.
That's certainly far from impossible, as the Earth has had two such periods, both lasting over a million years, that I know of. They might or might not have had similar effects, nobody knows for sure, but they did happen.
This comes from one of Bran's grandmother's tales, where she talks of one winter which had a night that lasted for a generation.
Somewhere on this planet is something like the Deccan or Siberian Traps. When they're quiet, it's summer, when they're active, winter sets in.
That's certainly far from impossible, as the Earth has had two such periods, both lasting over a million years, that I know of. They might or might not have had similar effects, nobody knows for sure, but they did happen.
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