The writer is a science commentator
The fall of one domino can produce a cascade of tumbling pieces. On a planetary scale, geohazards like earthquakes and volcanic eruptions can potentially set in train sequences of physical, social and political upheaval.
That might be the story behind the Black Death, the wave of bubonic plague that hit medieval Europe and killed up to half its population. According to new research, the 14th-century pandemic could be rooted in a series of volcanic eruptions that cooled the climate. This caused crops to fail, prompting Italian city-states like Venice to import grain from further afield.
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