Clumped isotopes tracing methane cycle and budget: a review - Xinchu Wang; Cong-Qiang Liu; Jiaxu Han; Jiarui Liu; Timothy Csernica; Naizhong Zhang; Hu Ding; Jonathan Gropp; Jennifer McIntosh; Si-Liang Li; Sheng Xu; Rob M. Ellam (Earth-Science Reviews, 2026)