As environmental challenges go, microfiber pollution has come from practically out of nowhere. It was only a decade or so ago that scientists first suspected our clothing, increasingly made of synthetic materials like polyester and nylon, might be major contributors to the global plastic problem. Today a growing body of science suggests the tiny strands that slough off clothes are everywhere and in everything. By one estimate, they account for as much as one-third of all microplastics released to the ocean. They’ve been found on Mount Everest and in the Mariana Trench, along with tap water, plankton, shrimp guts, and our poo.