From this high-level conceptual analysis, we see three main clusters of research interest: the green, blue, and red clusters. The green microplastic cluster shows other names associated with microplastics (plastics, nanoplastics), which reflects on the research into the role they play in environmental pollution (water pollution, environmental pollutants), and on the health concerns these can create via consumption by humans and animals (risk assessment, Homo sapiens, toxicity, bioaccumulation, fish).