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. 2020 Oct 21;166(10):894–908. doi: 10.1099/mic.0.000977

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© 2020 The Authors

This is an open-access article distributed under the terms of the Creative Commons Attribution License. This article was made open access via a Publish and Read agreement between the Microbiology Society and the corresponding author’s institution.

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Fig. 1. — Summary of natural and anthropogenic methane sources to the atmosphere. A proportion of coal bed methane is of biogenic origin [179]. The magnitude of each source as a percentage of the total (736 Tg CH₄ y⁻¹) is shown in parentheses. Data from reference [1].