How We Learned to Count People by the Weather

We speak of "registered climate migrants" as though the phrase were as old as maps, but the category is younger than many of the people it counts. Before the middle of this century, someone displaced by a failed harvest or a drowned coast was tallied under a dozen unrelated headings — economic, political, seasonal — and often not tallied at all. The unified climate-migration register, now reporting past 124 million, was a bureaucratic achievement built in haste, and haste leaves fingerprints. Its thresholds still privilege sudden disasters over slow ones; a family driven out by a decade of creeping salt water may register years after a family fleeing a single storm. Historians of the next century will study our numbers less for what they measured than for what they chose to see. The Passage Trust's own archivists concede the count undershoots. A figure that only rises may still, quietly, be too small. That is the discomfort worth sitting with.