Our ancestors were inventive in the face of crisis. Can we be, too? Credit: VCG Wilson/Corbis via Getty Images

The severe winter of February 2021 left Texas, Oklahoma, and Mississippi in blackout. At temperatures of -18 degrees centigrade, millions of people were left without power or running water. Alice Hill, a former risk assessor for the National Security Council under Obama, warned, “we are colliding with a future of extremes … the past … is no longer a safe guide.”
She was probably thinking of the recent past — the few centuries in which meteorological records have been kept. Figuring out past weather before that takes an ingenious combination of history, archaeology and science: eye-witness accounts and fluctuating grain prices are married with data from ice cores, grape-harvest dates and tree-ring sequences. But that tricky evidence indicates past climatic extremes that could provide “predictive points of reference for adaptation and loss reduction,” as Oliver Wetter, Jean-Laurent Spring et al argued in the science journal Climatic Change in 2014 (in a nice case of nominative determinism).
This evidence points to a Little Ice Age from around 1560. Winters were severe. Pieter Bruegel painted his hunters, their heads bent against the cold, trudging through deep snow towards villagers skating on a frozen river. But the Little Ice Age wasn’t just a deep freeze. It was also a “climatic seesaw”, writes Brian Fagan, of “arctic winters, blazing summers, serious droughts, torrential rain”. A winter storm in summer and a tropical hurricane at an unusual high latitude thrashed the Spanish Armada of 1588 far more roundly than the English warships.
One great drought predates the start of the Little Ice Age by 20 years. In February 1540 rainfall effectively ceased, falling only six times in London between then and September. It was not only exceptionally dry but warm: it is probable that the highest daily temperatures were warmer than 2003 (the warmest year for centuries). Charles Wriothesley’s Chronicle notes,
“This year was a hot summer and dry, so that no rain fell from June till eight days after Michaelmas [29 September], so that in divers parts of this realm the people carried their cattle six or seven miles to water them, and also much cattle died; and also there reigned strange sickness among the people in this realm, as laskes [dysentery] and hot agues, and also pestilence, whereof many people died…”
Edward Hall noted that the drought dried up wells and small rivers, while the Thames was so shallow that “saltwater flowed above London Bridge”, polluting the water supply and contributing to the dysentery and cholera, which killed people in their thousands. In Rome, no rain fell in nine months; in Paris, the Seine ran dry. Grapes withered on the vine and fruit rotted on trees. Even the small respite of autumn and winter was followed by a second warm spring and another blisteringly hot summer. Forests began to die until, in late 1541, rain fell and fell. 1542 was a year of widespread flooding.
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