1. Borrelle, S. B. et al. Opinion: why we need an international agreement on marine plastic pollution. Proc. Natl Acad. Sci. USA 114, 9994–9997 (2017).
2. United Nations Environment Assembly. Towards a pollution-free planet. Report No. UNEP/EA.3/L.19 (United Nations, 2017).
3. Isensee, K. & Valdes, L. GSDR 2015 Brief: Marine Litter: Microplastics. (IOC/UNECSCO, 2015).
4. United Nations. Rio Declaration on Environment and Development. Report No. A/CONF.151/26 (United Nations, Rio de Janeiro, 1992).
5. United Nations. Transforming our World: The 2030 Agenda for Sustainable Development. Report No. A/RES/70/1 (United Nations, 2015).