Marine litter comes mainly from land-based sources, including agriculture, wastewater treatment plants, construction, transportation, unnecessary, avoidable and problematic plastic products and polymers, and a wide variety of personal and health care products; approximately 60 per cent of macroplastic leakage is from uncontrolled waste streams (UNEP 2018c; IRP 2019; van Truong et al. 2019; Geyer 2020;…