Sophia's minding her own business when—bing bong!—the doorbell announces an unexpected guest: a polar bear. Despite Sophia's protests, he walks right in, making himself at home. His ice cap is melting—where else is he supposed to go? Soon, more visitors arrive: a dispirited sea turtle and farmers whose lands have gone dry are joined by confused bees, more climate refugees, and a grumpy Bengal tiger. Sophia is frustrated and confused. She doesn't understand why they showed up at her house. . . or what any of this has to do with her. But as Sophia hears their stories, she learns that this is her fight, too. . . and discovers the power of collective action, the strength of her own voice, and how all of us are stronger together. They head to City Hall only to wait around for hours before being dismissed, and Sophia just can't hold it in anymore. And she does—and so can you. The Tantrum that Saved the World is part environmental story, part ode to community action, and part blueprint for building a better world—together, for all of us.