The short version: A sudden warming event caused by a massive release of methane, itself caused by a massive collapse of clathrate beds off the Alaskan North Slope, leads to severe weather with some very unanticipated events. In particular, Pacific sea-surface temperatures rise just enough that the two hurricane-forming regions in the Pacific grow sufficiently to merge (it would actually only take a few degrees), making most of the Pacific one giant hurricane-forming region and spawning a monster hurricane completely beyond any previous human experience.
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