Climate activist Greta Thunberg first heard about climate change when she was eight years old. She absorbed the solutions adults threw at her — recycle paper, study the data, train to be a climate scientist — but none of it felt like enough. "What's the point of learning facts in the school system," she asks, "when the finest science from that system means nothing to our politicians and society?" In this passionate call to action, Thunberg explains why, in August 2018, she walked out of school and stood firm outside the Swedish parliament in an effort to prompt change. As she says: "We have all the facts and solutions. All we have to do is wake up and change."