Scientists conducted a comprehensive review of research studies examining how mycorrhizal fungi—fungi that help plants grow by living in their roots—respond to environmental changes caused by humans. They analyzed nearly 2,900 studies and found that most research focuses on just one environmental stress at a time, with very little studying how multiple stresses work together. The review identifies important gaps in our knowledge, particularly for emerging environmental threats like microplastics and for certain types of mycorrhizal fungi that haven’t been studied as much.