The story of teenage climate activist Greta Thunberg is told through compelling, never-before-seen footage in this intimate documentary from Swedish director Nathan Grossman. Starting with her one-person school strike for climate action outside the Swedish Parliament, Grossman follows Greta - a shy student with Asperger's - in her rise to prominence and her galvanizing global impact as she sparks school strikes around the world. The film culminates with her extraordinary wind-powered voyage across the Atlantic Ocean to speak at the UN Climate Action Summit in New York City.