Ocean plankton, the foundation of the marine food web, are under pressure from climate change. A new NASA satellite, PACE, offers unprecedented detail on phytoplankton diversity, revealing how warming temperatures disrupt their populations. Ocean deserts are expanding, while coastal blooms are becoming more frequent and harmful, with some creating toxins that devastate marine life and local economies. Researchers combine satellite data with microscopic plankton analysis to understand these changes and comprehensively predict future scenarios.