I haven't read about this anywhere. Maybe someone will have already thought about it? The idea is that a sudden collapse of oil supplies and subsequent cascade collapse of many other life essential systems, especially in the autumn for reasons beyond the obvious would provoke a sudden burning of combustibles in the colder northern hemisphere as surviving populations attempt to keep warm through the winter. This would inflict catastrophic damage on the following two or three years agricultural capacity - already massively impacted by the loss of oil delivery. This in turn would lead to a very large drop in human populations across the globe. I call it The Carbon Winter hypothesis to differentiate it from a nuclear winter which would put soot far higher making a much a longer period of cooling, and less hope of a human population recovery of some sort at a later stage. You heard it from Crumple first...welcome to your future?
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