Focus on reducing methane pollution from all sources, not distractions over metrics

The report critiques the GWP* (Global Warming Potential Star) metric, arguing that while it may be useful for specific climate modeling, its application to national or sectoral policy is unfair and scientifically misleading. Unlike the standard GWP, which uses a zero-emission baseline, GWP* evaluates current emissions relative to past levels, potentially rewarding countries with historically high emissions and penalizing developing nations. The authors contend that this approach can be used to justify continued methane pollution, particularly in the livestock sector, and advocate for a 'multi-basket' approach that sets separate targets for short-lived pollutants like methane and long-lived gases like CO2 to ensure equitable and effective climate action.

• Methane is a significant driver of global warming, contributing 0.5°C to the approximately 1.1°C of human-caused warming since 1900.
• Agriculture is a major source of methane, accounting for roughly 40% of global methane pollution; to limit warming to 1.5°C, agricultural methane emissions need to be reduced by approximately 25%.
• GWP* differs from the standard GWP metric because it evaluates the impact of current emissions relative to a baseline of past emissions rather than a baseline of zero emissions.
• Using GWP* for national policy can result in unethical and inequitable outcomes by penalizing developing countries with growing livestock herds while rewarding developed countries that have historically high emission levels.
• The GWP* metric can produce negative CO2 equivalent results for countries with declining emissions, which the authors argue should be described as 'less warming' rather than 'climate cooling' because ongoing emissions still contribute to elevated temperatures.
• The authors recommend a 'multi-basket' approach to climate planning, which involves setting separate emission reduction targets for methane and other short-lived climate pollutants versus long-lived greenhouse gases like CO2 and N2O.

APA

Ferreira, F., & McCabe, D. (2024). Focus on reducing methane pollution from all sources, not distractions over metrics. Clean Air Task Force. https://www.catf.us/resource/focus-reducing-methane-pollution-all-sources-not-distractions-over-metrics/

Chicago

Ferreira, Fernanda, and David McCabe. Focus on reducing methane pollution from all sources, not distractions over metrics. Clean Air Task Force, 2024. https://www.catf.us/resource/focus-reducing-methane-pollution-all-sources-not-distractions-over-metrics/.

Wikipedia

{{cite report |last1=Ferreira |first1=Fernanda |last2=McCabe |first2=David |title=Focus on reducing methane pollution from all sources, not distractions over metrics |publisher=Clean Air Task Force |date=20 May 2024 |url=https://www.catf.us/resource/focus-reducing-methane-pollution-all-sources-not-distractions-over-metrics/ |access-date=23 October 2026 |via=Climate Insights Directory}}

BibTeX

@techreport{ferreira2024focus, author = {Ferreira, Fernanda and McCabe, David}, title = {{Focus on reducing methane pollution from all sources, not distractions over metrics}}, institution = {Clean Air Task Force}, year = {2024}, month = may, url = {https://www.catf.us/resource/focus-reducing-methane-pollution-all-sources-not-distractions-over-metrics/}, urldate = {2026-10-23}, note = {Indexed by Climate Insights Directory} }