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<p>Small wetlands remain underappreciated emission sources in the global methane budget. Using 30-m remote sensing data, we identify 160 million small wetlands (0.001–1 km²) in non-forested regions worldwide, contributing 24% of the total wetland methane emissions. Notably, methane emissions from small wetlands increased significantly over 2003–2022, with very small wetlands (&lt;0.1 km<sup>2</sup>) dominating the magnitude and growth of small-wetland emissions.</p>

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The underappreciated importance of small wetlands in global methane emissions

  • 期刊论文

  • 发表日期：

    2026年4月8日

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  • Fa Li,
  • Qing Zhu,
  • Kunxiaojia Yuan,
  • Etienne Fluet-Chouinard,
  • Xiao Zhang,
  • Jida Wang,
  • Sara H. Knox,
  • Hangkai You,
  • Min Chen,
  • Mengze Li,
  • Rafael Stern,
  • Alison M. Hoyt,
  • Gavin McNicol,
  • William J. Riley,
  • Shushi Peng,
  • Benjamin Poulter,
  • Avni Malhotra,
  • Sarah Cooley,
  • Zhen Zhang,
  • Songbai Hong,
  • Zichong Chen,
  • Zhe Zhu,
  • Peter A. Raymond,
  • Philippe Ciais,
  • Robert B. Jackson

摘要

Small wetlands remain underappreciated emission sources in the global methane budget. Using 30-m remote sensing data, we identify 160 million small wetlands (0.001–1 km²) in non-forested regions worldwide, contributing 24% of the total wetland methane emissions. Notably, methane emissions from small wetlands increased significantly over 2003–2022, with very small wetlands (<0.1 km2) dominating the magnitude and growth of small-wetland emissions.