Beneath the surface of British waters, the microscopic foundations of marine life are quietly reorganizing themselves under the combined weight of warming seas and human activity. Researchers at the University of Plymouth, drawing on more than 500 scientific studies, have documented what was long suspected but can now be demonstrated: the plankton communities that sustain fisheries, regulate atmospheric carbon, and feed the ocean's great chains of being are already shifting in composition and distribution. These organisms, invisible to the naked eye and largely absent from public imagination,