Methane Emissions on the Rise: Global Spatiotemporal Dynamics and Decoupling Trends

A recent study on global methane emissions has highlighted the need for urgent action to address the growing issue. Conducted by researchers at Shandong University of Science and Technology, the study applies advanced statistical analysis to data from 177 countries and regions between 2002 and 2022. The findings show that methane emissions have increased significantly over the past two decades, with a consistent yet slightly declining spatial clustering. High-emission areas such as Russia and China require stronger reduction policies, while regions experiencing negative decoupling, like South America, need sustainable development strategies to reduce emissions.

Key Takeaways:

• Methane emissions increased from 292.38 Tg in 2002 to 347.79 Tg in 2012 and further to 379.12 Tg in 2022, with a consistent yet slightly declining spatial clustering.
• High-emission clusters were concentrated in Russia and China, extending into Eastern Europe and Central Asia, while low-emission clusters were mainly found in Africa.
• Weak decoupling dominated globally, particularly in Africa, Asia, North America, and South America.
• The global Theil index for CH4 emission intensity showed growing inequality between regions, with greater inequality between regions than within them.
• The study highlights the need for international cooperation to achieve equitable global CH4 reductions, particularly in high-emission areas.
• The Shandong University of Science and Technology researchers emphasize the importance of addressing the growing inequality in CH4 emission intensity.

Statistics:

• Methane emissions: 292.38 Tg (2002), 347.79 Tg (2012), 379.12 Tg (2022)
• Spatial clustering: consistent yet slightly declining
• High-emission areas: Russia, China, Eastern Europe, Central Asia
• Low-emission clusters: mostly found in Africa
• Decoupling trends:

+ Weak decoupling: Africa, Asia, North America, South America

+ Strong decoupling: Oceania

+ Strong negative decoupling: South America

• Global Theil index for CH4 emission intensity: growing inequality between regions
• Global Theil index for CH4 emissions per capita: consistent decline, indicating narrowing global inequality

Sources:

• Spatiotemporal Dynamics of Global Anthropogenic Methane Emissions: Spatial Patterns, Decoupling Trends and Inequalities. ACS Omega, 2025.
• NewsRx. Investigators at Shandong University of Science and Technology Report Findings in Chemicals and Chemistry (Spatiotemporal Dynamics of Global Anthropogenic Methane Emissions: Spatial Patterns, Decoupling Trends and Inequalities). Global Warming Focus. August 4, 2025; p 1783.