As the world moves toward addressing plastic pollution through the United Nations Environment Programme’s (UNEP) Global Plastic Treaty, a vital step is to establish comprehensive plastic inventories. These inventories help quantify plastic flows and set baselines within the city, enabling countries to make informed decisions about their solid waste management (SWM) system. This can be carried out by adapting policies, monitoring the waste situation, more efficiently managing resources, and developing strategies. The Waste Flow Diagram (WFD) serves as a vital tool that can support countries to address plastic pollution and detect hotspot zones, as outlined in current INC-4 Plastics Treaty Draft.

Why do we need plastic inventories?

Waste inventories track and assess the amount of plastic produced, generated, recycled, recovered, and disposed within a city. This allows governments and key stakeholders to monitor and evaluate the effectiveness of the current SWM system performance, set achievable and realistic targets for reducing waste, and adapt policies as needed. These inventories serve as a foundation for evaluating existing plastic pollution and what their environmental fates are whether that be openly dumped and burned or end up in water systems and drains.

It also involves understanding how much plastic waste is recycled and disposed of. This data-driven approach helps inform policies that tackle plastic waste more effectively, ultimately reducing pollution and promoting a circular economy. The treaty also promotes the collection of data on plastic pollution to support ongoing monitoring and evaluation of the progress toward reducing plastic waste. These provisions align with the need for robust plastic inventories, which enable governments to identify critical points in the plastic lifecycle and prioritize actions accordingly.

How the WFD supports plastic inventories

The WFD is a practical and simple tool for understanding plastic waste flows. It uses both primary data and field observations to map the movement of plastic waste throughout the waste value chain. It allows for the identification of key leakage points and how waste flows through the SWM system, enabling governments to target their interventions effectively. This data is crucial for developing policies and economic instruments such as Extended Producer Responsibility (EPR) programs to cover the cost of the SWM system and improve resource management (GIZ, 2015).

The WFD’s ability to assess plastic waste material flows is especially critical in the creation of plastic inventories. By highlighting the points where plastic waste escapes the waste management system, the WFD highlights areas requiring urgent attention. For example, data gaps often exist in low-income areas, informal settlements, or locations without reliable waste collection services. By addressing these gaps, the WFD facilitates more accurate plastic inventories and ensures that interventions are targeted toward underserved communities where plastic pollution may be most prevalent.

Combining this with the Wasteaware Benchmark Indicators (WABI) can enhance the SWM system as this tool pinpoints where the system’s strengths and weaknesses are, allowing for increased awareness on where efforts should be placed as a priority.

By integrating the WFD into their plastic monitoring frameworks, countries can better prioritize actions to reduce plastic waste and measure the impact of interventions in line with the treaty’s objectives.

Conclusion

Establishing plastic inventories is vital for any country committed to addressing plastic pollution. The WFD plays a key role in this process and for understanding plastic flows, identifying pollution hotspots, and implementing effective policies. By leveraging tools like the WFD in line with the treaty’s guidelines, governments and key stakeholders can ensure that their waste management strategies are both comprehensive and effective, to enhance their plastic inventories and take significant steps toward mitigating the global plastic pollution problem. These efforts, when aligned with the goals of the Plastics Treaty, bring us closer to a world where plastic pollution is reduced, and a circular economy for plastics becomes a reality.

Resources

GIZ. (2015). Economic instruments in solid waste management: Applying economic instruments for sustainable solid waste management in low and middle-income countries. GIZ.