The inspiring story of a young Swedish schoolgirl who sparked a worldwide revolution, told in a new Who HQ NOW format for trending topics. When she was just fifteen years old, Greta Thunberg knew she wanted to change the world. With a hand-painted sign that read "School strike for the climate" in Swedish, Greta sat alone on the steps of the Swedish parliament to call for stronger action on climate change. Her one-person strike would soon spark a worldwide movement. This exciting story details the defining moments in Greta's childhood that led up to her now-famous strike and all the monumental ones that have fueled her revolution since, including being named Time 's Most Influential Person of the Year in 2019.