The Waste Methane Toolbox

The waste sector accounts for approximately 20% of global anthropogenic methane emissions, equivalent to 5.4 Gt CO2e annually. This guide proposes a policy matrix organized by the solid waste management (SWM) chain to help policymakers implement a combination of legislative, market-based, voluntary, and educational tools. Key strategies include waste prevention, organic waste diversion (composting and anaerobic digestion), and improved landfill engineering (gas capture and biocovers). The document emphasizes that meeting the 1.5 degrees Celsius warming limit requires a comprehensive approach across the entire SWM chain rather than isolated solutions. It provides case studies from Colombia, Germany, India, Italy, Perú, the Republic of Korea, and the United States to illustrate how different nations layer these policy tools to reduce emissions.

• The waste sector, including solid waste and wastewater, contributes roughly 20% of global anthropogenic methane emissions, which is approximately 5.4 gigatons of carbon dioxide equivalents (Gt CO2e) per year.
• Global waste sector methane emissions are projected to grow, potentially exceeding 9 Gt CO2e by 2050, as solid waste generation is estimated to increase by over 70% relative to a 2020 baseline.
• Up to 80% of solid waste emissions can be mitigated using existing, technologically feasible, and cost-effective technologies.
• Methane mitigation in the solid waste management (SWM) chain is categorized into three primary stages: waste prevention and minimization (including food rescue), source separation and organic waste diversion/treatment (such as composting and anaerobic digestion), and improved design and operation of final disposal sites (including gas capture and biocovers).
• Implementing individual mitigation solutions (such as only gas capture or only organic treatment) could reduce GHG emissions from waste by 27% to 70% by 2050, but a comprehensive strategy across all SWM categories is required to limit warming to 1.5 degrees Celsius.
• The guide proposes four simplified categories of policy tools for governments: Legislative and Regulatory Approaches (e.g., pollution standards, bans), Market-Based Approaches (e.g., landfill taxes, PAYT), Voluntary Agreements (e.g., public-private partnerships), and Information and Education Approaches (e.g., technical assistance, behavior change programs).

APA

Siegel, K., Rowland, A., Damodaran, N., Godlove, C., Sasso, M., Douglas, F., Garzon, I., Holley, P. G., & Schroeder, D. (2025). The Waste Methane Toolbox. Clean Air Task Force. https://www.catf.us/wp-content/uploads/2025/03/waste-methane-toolbox.pdf

Chicago

Siegel, Kait, Amy Rowland, Nimmi Damodaran, Chris Godlove, Mary Sasso, Felicia Douglas, Isabel Garzon, Paula Garcia Holley, and Darin Schroeder. The Waste Methane Toolbox. Clean Air Task Force, 2025. https://www.catf.us/wp-content/uploads/2025/03/waste-methane-toolbox.pdf.

Wikipedia

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BibTeX

@techreport{siegel2025waste, author = {Siegel, Kait and Rowland, Amy and Damodaran, Nimmi and Godlove, Chris and Sasso, Mary and Douglas, Felicia and Garzon, Isabel and Holley, Paula Garcia and Schroeder, Darin}, title = {{The Waste Methane Toolbox}}, institution = {Clean Air Task Force}, year = {2025}, month = mar, url = {https://www.catf.us/wp-content/uploads/2025/03/waste-methane-toolbox.pdf}, urldate = {2026-10-23}, note = {Indexed by Climate Insights Directory} }