Time’s Person of the Year is its youngest ever: Greta Thunberg, the teen climate activist.

By Charlotte Alter, Suyin Haynes and Justin Worland. Photographs by Evgenia Arbugaeva for TIME.
Thunberg began a global movement by skipping school: starting in August 2018, she spent her days camped out in front of the Swedish Parliament, holding a sign painted in black letters on a white background that read Skolstrejk för klimatet: “School Strike for Climate.”