Biomethane produced from maize grown on peat emits more CO2 than natural gas

Author:

Evans Christopher1ORCID,Rowe Rebecca1,Freeman Benjamin1,Rhymes Jennifer1,Cumming Alex1,Lloyd Isobel2,Morton Daniel1,Williamson Jennifer1,Morrison Ross1

Affiliation:

1. UK Centre for Ecology and Hydrology

2. University of Leeds

Abstract

Abstract

Cultivation of maize for biomethane production has expanded rapidly, including on drained peat soils. The resulting soil CO2 emissions at the point of feedstock production are largely overlooked when assessing biogas climate mitigation potential. Based on field-scale flux measurements, we calculate that soil CO2 emissions from biomethane feedstock production on drained peat exceed embodied emissions for an equivalent amount of natural gas by up to a factor of three.

Publisher

Springer Science and Business Media LLC

Reference19 articles.

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2. Global Potential of Biogas. World Biogas Association (2019). https://www.worldbiogasassociation.org/wp-content/uploads/2019/09/WBA-execsummary-4ppa4_digital-Sept-2019.pdf

3. Consequential life cycle assessment of biogas, biofuel and biomass energy options within an arable crop rotation;Styles D;Global Change Biology Bioenergy,2015

4. Greenhouse gas emissions intensity of global croplands;Carlson KM;Nature Climate Change,2017

5. The underappreciated potential of peatlands in global climate change mitigation strategies;Leifeld J;Nature Communications,2018

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