Microplastics are very small pieces of plastic commonly defined as less than 5 millimetres (mm) in size. They include nanoplastics, which are generally agreed to be less than 1 micrometre (μm) (GESAMP 2016). Microplastics exist in many forms, including fragments, fibres (referred to as“microfibres”), spheres, films and pellets. Now ubiquitous in the environment, they are…