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. 2018 May 4;11:129. doi: 10.1186/s13068-018-1128-6

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© The Author(s) 2018

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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 Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 1 — Methane emission by sources from 1990 to 2015 in the US (data taken from the report of US Environmental Protection Agency: Inventory of US Greenhouse Gas Emissions and Sinks: 1990–2015). WWT wastewater treatment