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. 2019 Jul 18;10:3169. doi: 10.1038/s41467-019-10996-2

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 4 — Biomethanation reaction systems. a A simplified scheme describing the methanation of CO₂ catalyzed by archaea. Reproduced from ref. ⁹⁷ (Copyright [2002], Elsevier)⁹⁷. b A hybrid system for photomethanation utilizing CO₂-metabolizing archaea in the cathode compartment as adapted with permission from ref. ⁵⁸