Specialized microbes introduced into organic waste to convert nitrous oxide (N₂O) emissions into nitrogen gas (N₂), reducing greenhouse gas emissions in waste treatment and fertilizer applications associated with nitrogen-rich agricultural systems.
NOx-eating microbes refer to Nitrous Oxide Respiring Bacteria (NRB), which are specialized microbes that can be introduced into organic waste to mitigate nitrous oxide (N₂O) emissions. These bacteria use N₂O as an electron acceptor during respiration, converting it into nitrogen gas (N₂). By integrating NRB into waste treatment and fertilizer application processes, this innovation targets reducing greenhouse gas emissions associated with denitrification pathways in nitrogen-rich agricultural systems. Initial field trials indicate a reduction of N₂O emissions by 50-95%, depending on soil type and application method, giving the innovation high potential depending on scaling and adoption.
This innovation addresses agricultural nitrous oxide emissions, which are responsible for a substantial portion of global greenhouse gas emissions, with N₂O being 300 times more potent than CO₂. These emissions stem from the storage and application of animal manure and synthetic nitrogenous fertilizer to agricultural soils, arising as a byproduct from the natural denitrification process. The innovation aims to significantly reduce these through applying nitrous oxide respiring bacteria to locations of high nitrous oxide emissions, like in organic waste used as fertilizer.
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Engagement with stakeholders, transparency in trials, and clear communication of benefits are critical to foster trust.
Acceptance of microbial innovations as a viable solution to greenhouse gas mitigation will require ongoing education and demonstration. A mindset shift towards valuing solutions to increase sustainability if practices is also essential.
Inclusive stakeholder dialogues and demonstration projects are essential to gaining broad societal acceptance.
Sustained investment in R&D, field trials, and infrastructure is necessary to scale this innovation effectively.
Policies to subsidize microbial solutions and integrate them into carbon markets will be crucial for adoption.
The innovation requires adaptation of agricultural and environmental policies to support the use of microbial inoculants in fertilizers.
Continuous monitoring of microbial spread, effectiveness, and unintended ecosystem impacts will be necessary.
Pathways include piloting in controlled environments, scaling to diverse agricultural settings, and building robust support systems for implementation.
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Jonassen, K.R., Ormåsen, I., Duffner, C., Hvidsten, T.R., Bakken, L.R., & Vick, S.H.W. (2022). A dual enrichment strategy provides soil- and digestate-competent nitrous oxide-respiring bacteria for mitigating climate forcing in agriculture. mBio, 13(3), e0078822. https://doi.org/10.1128/mbio.00788-22
Jonassen, K.R., Hagen, L.H., Vick, S.H.W., Arntzen, M.Ø., Eijsink, V.G.H., Frostegård, Å., Lycus, P., Molstad, L., Pope, P.B., & Bakken, L.R. (2022). Nitrous oxide respiring bacteria in biogas digestates for reduced agricultural emissions. The ISME Journal, 16, 580–590. https://doi.org/10.1038/s41396-021-01101-x
Wang, X., Xiang, B., Li, J., Zhang, M., Frostegård, Å., Bakken, L., & Zhang, X. (2023). Using adaptive and aggressive N2O-reducing bacteria to augment digestate fertilizer for mitigating N2O emissions from agricultural soils. Science of The Total Environment, 903, 166284. https://doi.org/10.1016/j.scitotenv.2023.166284
Winiwarter, W. & Greenwell, B. (2024, May 30). New method could significantly reduce agricultural greenhouse gas emissions. International Institute for Applied Systems Analysis. https://iiasa.ac.at/news/may-2024/new-method-could-significantly-reduce-agricultural-greenhouse-gas-emissions
