Microplastics seem to be everywhere—from our oceans and air , to drinking water and cosmetic products. Researchers have even found evidence of microplastics , and smaller nanoplastics, throughout the human body . Now, scientists have reason to believe that airborne microscopic particles could even be contributing to the warming of our planet . It begs the question: how worried should we be? What are the sources of airborne microplastics? Microplastics are minuscule particles— less than five