a crowd of poor people
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The latest report from the U.N. Intergovernmental Panel on Climate Change is out, with its layers of deadening bureaucratic prose. Climate watchers have had their latest chance to make out, as best they can, what biblical futures await us on a hotter, drier, stormier planet. Two sentences from the report's second installment struck me with the force of a storm surge: “Climate change is projected to progressively increase inter-annual variability of crop yields in many regions. These projected impacts will occur in the context of rapidly rising crop demand.” Translation: We’ll have smaller harvests in the future, less food, and 3 billion more mouths to feed.

The IPCC has done an heroic job of digesting thousands of scientific papers into a bullet-point description of how global warming is shrinking food and water supplies, most drastically for the poorest of Earth’s 7 billion human inhabitants. Being scientists, though, they fail miserably to communicate the gravity of the situation. The IPPC language, at its most vivid, talks of chronic “poverty traps” and “hunger hotspots” as the 21st century unfolds. The report offers not a single graspable image of what our future might actually look like when entire populations of people — not only marginalized sub-groups — face perennial food insecurity and act to save themselves. What decisions do human communities make en masse in the face of total environmental collapse? There are no scientific papers to tell us this, so we must look to history instead for clues to our dystopian future.

The last global climate crisis for which we have substantial historical records began 199 years ago this month, in April 1815, when the eruption of Mt. Tambora in Indonesia cooled the Earth and triggered drastic disruptions of major weather systems worldwide. Extreme volcanic weather — droughts, floods, storms — gripped the globe for three full years after the eruption.

In the Tambora period from 1815 to 1818, the global human community consisted mostly of subsistence farmers, who were critically vulnerable to sustained climate deterioration. The occasional crop failure was part of life, but when relentless bad weather ruined harvests for two and then three years running, extraordinary, world-changing things started to happen. The magnitude and variety of human suffering in the years 1815 to 1818 are in one sense incalculable, but three continental-scale consequences stand out amid the misery: slavery, refugeeism, and the failure of states.