As one of the top emitters of methane (CH), China must take action to achieve its carbon neutrality goal. Programs to reduce CH emissions would benefit from the establishment of the China Certified Emission Reduction (CCER) trading market. However, studies investigating the impact of the CCER trading market on CH reduction remain limited. This study therefore analyzes the emission reduction performance of CH-related CCER projects and investigates their accounting methodologies. The results show that 182 CH emissions reduction projects were registered between 2012 and 2017, covering coal mining, energy, waste treatment and disposal, and agriculture, with an annual emissions reduction of 19.8 MtCOe. It was observed that, while the pre-restart methodology system covered a wide range of emission reduction areas, its application frequency was unevenly distributed. Most projects were registered in only a few emission reduction domains, with the majority of methodologies remaining unused since their publication. Moreover, the IPCC default values were frequently used in China-specific emission accounting, leading to significant uncertainties. Recommendations are made on how to improve the effectiveness of CH emissions reduction measures based on this analysis.
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