Summary
This paper by Pete Smith evaluates soil carbon sequestration and biochar addition as negative emissions technologies capable of contributing to climate stabilisation. The analysis indicates both approaches offer negative emission potential of approximately 0.7 GtCeq yr⁻¹ each, with potentially lower collateral impacts on land, water, nutrients, and cost than alternative NETs. The author identifies key limitations—particularly sink saturation and reversibility for soil carbon sequestration—and recommends integration of these options into integrated assessment models for improved climate policy scenarios.
UK applicability
Soil carbon sequestration and biochar deployment are directly relevant to UK agricultural policy and climate targets, particularly given the UK's commitment to net-zero emissions and the prevalence of mixed and arable farming systems. The findings support inclusion of these low-impact mitigation approaches in UK climate assessment models and land-use planning, though site-specific reversibility and saturation dynamics would require localised evaluation.
Key measures
Negative emission potential (GtCeq yr⁻¹); impacts on land use, water use, nutrients, albedo, energy requirements, and cost; comparison with other NETs (direct air capture, enhanced weathering, bioenergy with carbon capture and storage, afforestation/deforestation)
Outcomes reported
The paper assessed the negative emission potential of soil carbon sequestration and biochar addition, estimating each approach could deliver approximately 0.7 GtCeq yr⁻¹ of negative emissions. It evaluated the global impacts of these technologies on land use, water consumption, nutrient cycling, albedo, energy requirements, and economic cost compared to other negative emissions technologies.
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