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Land-neutral negative emissions through biochar-based fertilization—assessing global potentials under varied management and pyrolysis conditions.
- Source :
- Mitigation & Adaptation Strategies for Global Change; Jun2024, Vol. 29 Issue 5, p1-28, 28p
- Publication Year :
- 2024
-
Abstract
- Climate stabilization is crucial for restabilizing the Earth system but should not undermine biosphere integrity, a second pillar of Earth system functioning. This is of particular concern if it is to be achieved through biomass-based negative emission (NE) technologies that compete for land with food production and ecosystem protection. We assess the NE contribution of land- and calorie-neutral pyrogenic carbon capture and storage (LCN-PyCCS) facilitated by biochar-based fertilization, which sequesters carbon and reduces land demand by increasing crop yields. Applying the global biosphere model LPJmL with an enhanced representation of fast-growing species for PyCCS feedstock production, we calculated a land-neutral global NE potential of 0.20–1.10 GtCO<subscript>2</subscript> year<superscript>−1</superscript> assuming 74% of the biochar carbon remaining in the soil after 100 years (for + 10% yield increase; no potential for + 5%; 0.61–1.88 GtCO<subscript>2</subscript> year<superscript>−1</superscript> for + 15%). The potential is primarily driven by the achievable yield increase and the management intensity of the biomass producing systems. NE production is estimated to be enhanced by + 200–270% if management intensity increases from a marginal to a moderate level. Furthermore, our results show sensitivity to process-specific biochar yields and carbon contents, producing a difference of + 40–75% between conservative assumptions and an optimized setting. Despite these challenges for making world-wide assumptions on LCN-PyCCS systems in modeling, our findings point to discrepancies between the large NE volumes calculated in demand-driven and economically optimized mitigation scenarios and the potentials from analyses focusing on supply-driven approaches that meet environmental and socioeconomic preconditions as delivered by LCN-PyCCS. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 13812386
- Volume :
- 29
- Issue :
- 5
- Database :
- Complementary Index
- Journal :
- Mitigation & Adaptation Strategies for Global Change
- Publication Type :
- Academic Journal
- Accession number :
- 176487879
- Full Text :
- https://doi.org/10.1007/s11027-024-10130-8