The previously increasing atmospheric methane concentration has inexplicably stalled over the past three decades. This may be due to a fall in fossil-fuel emissions or to farming practices that are curtailing microbial sources. See Letters p.194 & p.198
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Heimann, M. Enigma of the recent methane budget. Nature 476, 157–158 (2011). https://doi.org/10.1038/476157a
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DOI: https://doi.org/10.1038/476157a
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