Population regime· The columns of time
The acceleration
1950 → Today
2.5 billion people in 1950, 8.2 billion in 2024 (UN World Population Prospects). Most of the curve fits in one human lifetime.
What the evidence shows
From 2.5 billion in 1950 to 8.2 billion in 2024: more than two thirds of that figure was added inside a single human lifetime, which no other band on this frieze can claim. The growth rate peaked in the late 1960s and has been falling since; the total still rises because the generations born during the peak are still having children. That is why projections converge on a plateau this century rather than on a continued climb.
Bounds and conventions
Modern counts still carry an uncertainty of a few per cent: censuses are periodic rather than continuous, civil registration is incomplete in a number of countries, and the most recent figures are projections from the last enumeration rather than enumerations themselves.