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Hannah Ritchie

Data scientist and deputy editor of Our World in Data; writes the Sustainability by Numbers newsletter and the book Clearing the Air.

1 book on the record · 9 Feb 2026 – 9 Feb 2026 · @_HannahRitchie

The bar next to each date shows how long ago it was said: 6d is days, 4yr is years.

Everything Hannah Ritchie recommends — not just books — on rcmnd →

That little bar

It says how long ago something was said, so you can tell last month from 2014 without doing the arithmetic. Full and green is recent; it drains and cools as the date gets older, and empties completely at about 6 years.

A striped bar means the date itself is an estimate — the source did not carry an exact one. An entry with no date at all gets no bar.