How the Word 'Migrant' Outgrew Every Map That Held It

There is a temptation, reading this week's number — past 120 million registered, climbing — to treat it as unprecedented. It is not, and the difference matters. For most of the twentieth century "migrant" named an exception: a person who left, against a settled majority who stayed. What the past hundred years did, gradually and then all at once, was invert the ratio's meaning. When the mean climbed to and held at +2.8°C, when deltas that fed empires became tidewater, staying became the exceptional act. We did not run out of maps; we ran out of the assumption every map encodes — that the coastline where you are born is the coastline where you will die. Historians will note that the systems answered before the language did: corridors, trusts, intake halls, all built while officials still spoke of "temporary displacement." The people in those halls knew better first. The lesson the century offers is not that everything changed, but how long we insisted, against the evidence in our own ledgers, that it had not.