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Global trade routes are responsible for significant methane (CH4) emissions, with major economies driving these flows. Targeted international cooperation is crucial for effective methane mitigation strategies.

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Area of Science:

  • Environmental Science
  • Climate Change Research
  • Economic Network Analysis

Background:

  • Intensifying globalization facilitates the outsourcing of anthropogenic methane (CH4) emissions via complex global trade networks.
  • Methane (CH4) is a potent greenhouse gas and harmful air pollutant, necessitating an understanding of its emission flows.
  • Previous studies have not fully explored CH4 flow patterns within global trade from a complex network perspective.

Purpose of the Study:

  • To analyze the structural characteristics of the global CH4 flow network (GCFN) using complex network analysis.
  • To quantify the extent of CH4 emissions embodied in international trade.
  • To identify key economies and network structures influencing global CH4 emissions.

Main Methods:

  • Integration of the global CH4 emission inventory from EDGAR (Emission Database for Global Atmospheric Research).
  • Utilization of the global multi-regional input-output model from the GTAP database.
  • Application of complex network analysis to reveal GCFN structures.

Main Results:

  • Over a quarter of global anthropogenic CH4 emissions in 2014 were linked to international trade.
  • The top 20 economies account for approximately 70% of total embodied CH4 emission flows.
  • GCFNs exhibit tripartite patterns centered on China, the USA, and Russia, with emerging economies like Thailand and Brazil also playing significant roles. A core-periphery structure highlights a few hub economies responsible for substantial CH4 emissions.

Conclusions:

  • Multinational cooperation is essential for global CH4 emission mitigation.
  • Focused mitigation policies should target key economies identified within the GCFN.
  • Understanding trade-embodied emissions is critical for effective climate change strategies.