Meet Greta Thunberg, the environmental activist.

When young Greta learned of the climate crisis, she stopped talking. She couldn't understand why people in power were not doing anything to save our Earth. One day she started protesting outside the Swedish Parliament, creating the "School Strike for Climate." Soon, lots more young people joined her in a global movement that shook adults and politicians alike. She had found her voice and uses it to inspire humans to action with her powerful message: "No one is too small to make a difference."