Cited by 90Soil Carbon and Nitrogen DynamicsBioenergy crop production and managementAtmospheric and Environmental Gas Dynamics

N2O Release from Agro-biofuel Production Negates Global Warming Reduction by Replacing Fossil Fuels

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Crutzen, Paul J., Mosier, A. R., Smith, K. A., Winiwarter, W.·2016·SpringerBriefs on Pioneers in Science and Practice

Abstract

The relationship, on a global basis, between the amount of N fixed by chemical, biological or atmospheric processes entering the terrestrial biosphere, and the total emission of nitrous oxide (N 2 O), has been re-examined, using known global atmospheric removal rates and concentration growth of N 2 O as a proxy for overall emissions. For both the pre-industrial period and in recent times, after taking into account the large-scale changes in synthetic N fertiliser production, we find an overall conversion factor of 3–5 % from newly fixed N to N 2 O–N. We assume the same factor to be valid for biofuel production systems. It is covered only in part by the default conversion factor for ‘direct’ emissions from agricultural crop lands (1 %) estimated by IPCC (2006), and the default factors for the ‘indirect’ emissions (following volalilization/deposition and leaching/runoff of N: 0.35–0.45 %) cited therein. However, as we show in the paper, when additional emissions included in the IPCC methodology, e.g. those from livestock production, are included, the total may not be inconsistent with that given by our “top-down” method. When the extra N 2 O emission from biofuel production is calculated in “CO 2-equivalent” global warming terms, and compared with the quasi-cooling effect of ‘saving’ emissions of fossil fuel derived CO 2, the outcome is that the production of commonly used biofuels, such as biodiesel from rapeseed and bioethanol from corn (maize), depending on N fertilizer uptake efficiency by the plants, can contribute as much or more to global warming by N 2 O emissions than cooling by fossil fuel savings. Crops with less N demand, such as grasses and woody coppice species, have more favourable climate impacts. This analysis only considers the conversion of biomass to biofuel. It does not take into account the use of fossil fuel on the farms and for fertilizer and pesticide production, but it also neglects the production of useful co-products. Both factors partially compensate each other. This needs to be analyzed in a full life cycle assessment.

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Crossref · 10.1007/978-3-319-27460-7_12

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Authors
Crutzen, P. J., Mosier, A. R., Smith, K. A., & Winiwarter, W.
Affiliations
  • International Institute for Applied Systems Analysis (AT)
  • University of Edinburgh (GB)
Venue
SpringerBriefs on Pioneers in Science and Practice
Published
2016
Pages
227-238
ISSN
  • 2194-3125 (ISSN-L)
  • 2194-3133
OpenAlex
W4299592724
Cited by
90
References
19
Citations by year
2026: 2 · 2025: 3 · 2024: 7 · 2023: 6 · 2022: 8 · 2021: 9 · 2020: 8 · 2019: 11 · 2018: 6 · 2017: 7 · 2016: 3 · 2015: 2 · 2014: 1 · 2013: 2 · 2012: 3
FWCI
16.57
Type
book chapter
Language
en
Open access
Locations
  • SpringerBriefs on pioneers in science and practice (publishedVersion, cc-by)
  • IIASA PURE (International Institute of Applied Systems Analysis) (submittedVersion)
  • Max Planck Institute for Plasma Physics (submittedVersion)
Topics
  • Life Sciences › Agricultural and Biological Sciences › Soil Science › Soil Carbon and Nitrogen Dynamics
  • Life Sciences › Agricultural and Biological Sciences › Agronomy and Crop Science › Bioenergy crop production and management
  • Physical Sciences › Environmental Science › Global and Planetary Change › Atmospheric and Environmental Gas Dynamics
Keywords
nitrous oxide emissions, biofuels, nitrogen fixation, nitrogen fertilization, global warming, fossil fuel substitution, biodiesel, bioethanol, maize, Brassica napus, Poaceae, coppice, livestock emissions

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