Purpose of Review

To investigate which processes cause the current increase in atmospheric methane in the context of future interactions between climate change, the methane cycle and policy decisions.

Recent Findings

There is evidence for various contributors to emission increases or reduced removal of atmospheric methane. No single process can explain the methane rise and remain consistent with available data. Reconstructions of recent changes in the methane budget do not converge as to the dominant contributor to the rise. A plausible scenario includes increasing emissions from agriculture and fossil fuels while biomass burning is reduced, with possible contributions from wetlands and a weakened sink.

Summary

Further studies are needed to identify contributors to the methane rise for targeted emission reductions and adaptation to changes in natural methane sources and sinks. Mitigation plans must address the methane rise and possible consequences from a climate-methane feedback.

中文翻译：

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大气甲烷近期趋势的成因与后果

审查目的

在气候变化，甲烷循环和政策决策之间的未来相互作用的背景下，调查哪些过程导致当前大气中的甲烷增加。

最近的发现

有证据表明，各种增加排放量或减少了大气甲烷清除的因素。没有任何一个过程可以解释甲烷的上升并与可用数据保持一致。甲烷预算最近变化的重建并不能收敛于上升的主要贡献者。可能的情况包括增加农业和化石燃料的排放，同时减少生物质燃烧，这可能是由于湿地和水槽减弱造成的。

概要

需要进一步的研究，以查明造成甲烷排放量增加的原因，以便有针对性地减少排放量并适应自然甲烷源和汇的变化。缓解计划必须解决甲烷上升以及气候甲烷反馈可能造成的后果。