Research article

Soil carbon farming has the potential to bridge the global emissions gap

Authors
  • Jacqueline McGlade orcid logo (university college london)
  • downforce technologies (downforce technologies)

This article is a preprint and is currently undergoing peer review by UCL Open: Environment.

Abstract

There is growing interest globally in soil health and the role that enhanced soil organic carbon (SOC) can play in climate change mitigation, resilience, and food security. Different initiatives for SOC sequestration (SCS), such as Project Drawdown, ‘4p1000’ and RECSOIL have been proposed yet SCS commitments and targets are missing from the Nationally Determined Contributions (NDCs) to the 2015 Paris Agreement and the UNFCCC Global Stocktake. This paper asks whether a single, locally relevant target could be developed for SCS that would encourage widespread adoption of soil carbon removals practices by farmers and land managers globally? We used 210,00 local soils profiles from the World Soil Information System to assess the SOC potential of 2,352 million ha of agricultural land, identified with the Landsat Global Land Cover classification. Based on the local characteristics of the carbon sequestration capacity of soils, we found that a one percent average increase in SOC storage in croplands, pasture and irrigated fields would have the potential to sequester 84.9 GtC or 311 311 GtCO2-e [range 159 – 447 GtCO2-e]. This represents more than a decade of the emission reductions needed to have a chance of remaining on a 2°C or 1.5°C or Net Zero pathway. We argue that a one per cent target is easy to communicate and understand, especially as most farmers and land managers who regularly test their soils are familiar with the soil carbon percentages of their land.

Keywords: Soil Carbon Sequestration (SCS), Soil properties, Soil carbon storage potential, Carbon farming, Land classification, NDC, Emissions gap, Net Zero pathway, Climate, Policy and law, Sustainable development

Preprint Under Review

 Open peer review from Jules Pretty

Reviewer: Jules Pretty
ORCID: orcid logo https://orcid.org/0000-0002-3897-6581
DOI: 10.14293/S2199-1006.1.SOR-AG.AOSFKU.v1.RBSGGD
Date Completed: 2023-11-06

Review

Review information

DOI:: 10.14293/S2199-1006.1.SOR-AG.AOSFKU.v1.RBSGGD
License:
This work has been published open access under Creative Commons Attribution License CC BY 4.0 , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Conditions, terms of use and publishing policy can be found at www.scienceopen.com .

ScienceOpen disciplines: Earth & Environmental sciences , Agriculture , Geosciences
Keywords: Land classification , NDC , Net Zero pathway , Carbon farming , Soil carbon storage potential , Policy and law , Soil properties , Climate , Emissions gap , Sustainable development , Soil Carbon Sequestration (SCS)

Review text

This is an important, timely and clearly-written paper on the value and potential for soil carbon sequestration to contribute to climate mitigation. It is clear that absolute emissions reductions will be essential for the global transition to net zero. The UNFPCC's Race to Zero project mandates 80% of net zero achievements must be emissions cuts. The remain 20% (of the current 56 Gt of carbon dioxide equivalent) can come from long-term carbon capture. The authors have shown how more sustainable forms of agriculture are already locking up carbon below and above-ground. This paper summarises mechanisms, and provides authoritative quantitative analysis. The findings here are relevant and communicable to and for farmers, as well as researchers and policy makers.

I have no hesitation in recommending this paper for publication in UCL Open Environment. It meets all the essential criteria



License: Creative Commons Attribution 4.0

Attribution — You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use. No additional restrictions — You may not apply legal terms or technological measures that legally restrict others from doing anything the license permits.

Note:
This review refers to round 1 of peer review and may pertain to an earlier version of the document.