Space Weather

Thanks to Nick Srnicek, I now know about this:

a region’s agriculture is vulnerable to variations in space weather if it meets three conditions: the local weather must be sensitive to space weather; the local agriculture must be critically vulnerable to sudden changes in weather; and finally, the region must be isolated.

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medieval England ... is vulnerable because it is in the north Atlantic, dependent on wheat which is vulnerable to weather changes and also isolated from mainland Europe.

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“All the nine cycles of solar activity during this period are characterized by systematically excessive wheat prices in the years of solar activity minimum, as compared with the prices during the next maximum"...