; (2) recommendations on knowledge gaps that warrant further scientific inquiry; and (3) recommendations on the potential value of a national marine debris tracking and monitoring system and how such a system might be designed and implemented. 504. Report on minimizing the creation of new plastic waste Not later than 2 years after the date of the enactment of this Act, the Interagency Marine Debris Coordinating Committee shall submit to Congress a report on minimizing the creation of new plastic waste. 505. Study on mass balance methodologies to certify circular polymers (a) In general The National Institute of Standards and Technology shall conduct a study of available mass balance methodologies that are or could be readily standardized to certify circular polymers. (b) Report Not later than 1 year after the date of enactment of this Act, the Institute shall submit to Congress a report on the study conducted under subsection (a) that includes— (1) an identification and assessment of existing mass balance methodologies, standards, and certification systems that are or may be applicable to supply chain sustainability of polymers, considering the full life cycle of the polymer, and including an examination of— (A) the International Sustainability and Carbon Certification; and (B) the Roundtable on Sustainable Biomaterials; and (2) an assessment of any legal or regulatory barriers to developing a standard and certification system for circular polymers. (c) Definitions In this section: (1) Circular polymers The term circular polymers means polymers that can be reused multiple times or converted into a new, higher-quality product. (2) Mass balance methodology The term mass balance methodology means the method of chain of custody accounting designed to track the exact total amount of certain content in products or materials through the production system and to ensure an appropriate allocation of this content in the finished goods based on auditable bookkeeping.