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Iset
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Mar 20, 2015 01:28PM

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It's a fantasy world, not everything is explainable by science. The seasons in ASOAIF world are clearly influenced by magic. I suspect we will learn about the cause of it all in the last book, when the final conflict and resolution happens - which will presumably be the invasion of the Others - perhaps even a second Long Night? The Others are described as not only thriving on the winter and cold, but bringing it with them.

Martin has been asked about the seasons a lot, and he's said that they used to be normal like on our Earth, but something happened that offset them and they're now like they are. All he's revealed is that it's due to magic imbalance, which he'll expand on eventually. For all intents and purposes, that planet is like ours.