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  Freshwater requirements of large-scale bioenergy plantations for limiting global warming to 1.5 °C

Stenzel, F., Gerten, D., Werner, C., Jägermeyr, J. (2019): Freshwater requirements of large-scale bioenergy plantations for limiting global warming to 1.5 °C. - Environmental Research Letters, 14, 8, 084001.
https://doi.org/10.1088/1748-9326/ab2b4b

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Stenzel, Fabian1, Author              
Gerten, Dieter1, Author              
Werner, Constanze1, Author              
Jägermeyr, Jonas1, Author              
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1Potsdam Institute for Climate Impact Research, ou_persistent13              

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 Abstract: Limiting mean global warming to well below 2 °C will probably require substantial negative emissions (NEs) within the 21st century. To achieve these, bioenergy plantations with subsequent carbon capture and storage (BECCS) may have to be implemented at a large scale. Irrigation of these plantations might be necessary to increase the yield, which is likely to put further pressure on already stressed freshwater systems. Conversely, the potential of bioenergy plantations (BPs) dedicated to achieving NEs through CO2 assimilation may be limited in regions with low freshwater availability. This paper provides a first-order quantification of the biophysical potentials of BECCS as a negative emission technology contribution to reaching the 1.5 °C warming target, as constrained by associated water availabilities and requirements. Using a global biosphere model, we analyze the availability of freshwater for irrigation of BPs designed to meet the projected NEs to fulfill the 1.5 °C target, spatially explicitly on areas not reserved for ecosystem conservation or agriculture. We take account of the simultaneous water demands for agriculture, industries, and households and also account for environmental flow requirements (EFRs) needed to safeguard aquatic ecosystems. Furthermore, we assess to what extent different forms of improved water management on the suggested BPs and on cropland may help to reduce the freshwater abstractions. Results indicate that global water withdrawals for irrigation of BPs range between ~400 and ~3000 km3 yr−1, depending on the scenario and the conversion efficiency of the carbon capture and storage process. Consideration of EFRs reduces the NE potential significantly, but can partly be compensated for by improved on-field water management.

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 Dates: 2019
 Publication Status: Finally published
 Pages: -
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 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1088/1748-9326/ab2b4b
PIKDOMAIN: RD1 - Earth System Analysis
eDoc: 8539
Research topic keyword: 1.5/2°C limit
Research topic keyword: CO2 Removal
Research topic keyword: Freshwater
Research topic keyword: Ecosystems
Research topic keyword: Planetary Boundaries
Model / method: LPJmL
Regional keyword: Global
Organisational keyword: RD1 - Earth System Analysis
Working Group: Terrestrial Safe Operating Space
Working Group: Land Use and Resilience
 Degree: -

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Title: Environmental Research Letters
Source Genre: Journal, SCI, Scopus, p3, oa
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Pages: - Volume / Issue: 14 (8) Sequence Number: 084001 Start / End Page: - Identifier: CoNE: https://publications.pik-potsdam.de/cone/journals/resource/150326