Mitigating climate change requires clean energy and the removal of atmospheric carbon. Building soil carbon is an appealing way to increase carbon sinks and reduce emissions owing to the associated benefits to agriculture. However, the practical implementation of soil carbon climate strategies lags behind the potential, partly because we lack clarity around the magnitude of opportunity and how to capitalize on it. Here we quantify the role of soil carbon in natural (land-based) climate solutions and review some of the project design mechanisms available to tap into the potential. We show that soil carbon represents 25% of the potential of natural climate solutions (total potential, 23.8 Gt of CO2-equivalent per year), of which 40% is protection of existing soil carbon and 60% is rebuilding depleted stocks. Soil carbon comprises 9% of the mitigation potential of forests, 72% for wetlands and 47% for agriculture and grasslands. Soil carbon is important to land-based efforts to prevent carbon emissions, remove atmospheric carbon dioxide and deliver ecosystem services in addition to climate mitigation.
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Banwart, S. et al. Benefits of soil carbon: report on the outcomes of an international scientific committee on problems of the environment rapid assessment workshop. Carbon Manage. 5, 185–192 (2014).
Wood, S. A. & Baudron, F. Soil organic matter underlies crop nutritional quality and productivity in smallholder agriculture. Agric. Ecosyst. Environ. 266, 100–108 (2018).
Sanderman, J., Hengl, T. & Fiske, G. J. Soil carbon debt of 12,000 years of human land use. Proc. Natl Acad. Sci. USA 114, 9575–9580 (2017).
Jenkinson, D. S., Adams, D. E. & Wild, A. Model estimates of CO2 emissions from soil in response to global warming. Nature 351, 304–306 (1991).
Pries, C. E. H., Castanha, C., Porras, R. C. & Torn, M. S. The whole-soil carbon flux in response to warming. Science 355, 1420–1423 (2017).
Smith, P. et al. Greenhouse gas mitigation in agriculture. Phil. Trans. R. Soc. B 363, 789–813 (2008).
Smith, P. et al. Land-management options for greenhouse gas removal and their impacts on ecosystem services and the Sustainable Development Goals. Annu. Rev. Environ. Resour. 44, 255–286 (2019).
Rumpel, C. et al. Put more carbon in soils to meet Paris climate pledges. Nature 564, 32–34 (2018).
Vermeulen, S. et al. A global agenda for collective action on soil carbon. Nat. Sustain. 2, 2–4 (2019).
von Unger, M. & Emmer, I. Carbon Market Incentives to Conserve, Restore and Enhance Soil Carbon (The Nature Conservancy, 2018).
Fuss, S. et al. Negative emissions—part 2: costs, potentials and side effects. Environ. Res. Lett. 13, 063002 (2018).
Hamrick, K. & Gallant, M. Fertile Ground: State of Forest Carbon Finance (Forest Trends’ Ecosystem Marketplace, 2017).
Koronivia Joint Work on Agriculture Decision 4/COP.23 (UNFCCC, 2018); https://unfccc.int/decisions
Smith, P. Soil carbon sequestration and biochar as negative emission technologies. Glob. Change Biol. 22, 1315–1324 (2016).
West, T. O. & Six, J. Considering the influence of sequestration duration and carbon saturation on estimates of soil carbon capacity. Climatic Change 80, 25–41 (2006).
Sommer, R. & Bossio, D. Dynamics and climate change mitigation potential of soil organic carbon sequestration. J. Environ. Manage. 144, 83–87 (2014).
Dass, P., Houlton, B. Z., Wang, Y. & Warlind, D. Grasslands may be more reliable carbon sinks than forests in California. Environ. Res. Lett. 13, 074027 (2018).
Wang, J., Xiong, Z. & Kuzyakov, Y. Biochar stability in soil: meta-analysis of decomposition and priming effects. GCB Bioenergy 8, 512–523 (2015).
Schlesinger, W. H. & Amundson, R. Managing for soil carbon sequestration: let’s get realistic. Glob. Change Biol. 25, 386–389 (2019).
Amundson, R. & Biardeau, L. Opinion: soil carbon sequestration is an elusive climate mitigation tool. Proc. Natl Acad. Sci. USA 115, 11652–11656 (2018).
White, R. E., Davidson, B., Lam, S. K. & Chen, D. A critique of the paper ‘Soil carbon 4 per mille’ by Minasny et al. (2017). Geofís. Int. 309, 115–117 (2018).
McLauchlan, K. K., Hobbie, S. E. & Post, W. M. Conversion from agriculture to grassland builds soil organic matter on decadal timescales. Ecol. Appl. 16, 143–153 (2006).
Smith, P. et al. Do grasslands act as a perpetual sink for carbon? Glob. Change Biol. 20, 2708–2711 (2014).
Gren, I.-M. & Aklilu, A. Z. Policy design for forest carbon sequestration: a review of the literature. For. Policy Econ. 70, 128–136 (2016).
Murray, B. C., Sohngen, B. & Ross, M. T. Economic consequences of consideration of permanence, leakage and additionality for soil carbon sequestration projects. Climatic Change 80, 127–143 (2006).
Joosten, H., Couwenberg, J., von Unger, M. & Emmer I. Peatlands, Forests and the Climate Architecture: Setting Incentives through Markets and Enhanced Accounting (German Environment Agency (UBA Climate Change), 2016); https://go.nature.com/3c9wZMy
von Unger, M., Emmer, I., Joosten, H. & Couwenberg, J. Designing an International Peatland Carbon Standard, Criteria, Best Practices and Opportunities (German Environment Agency (UBA Climate Change), 2019).
Federici, S., Lee, D. & Herold, M. Forest Mitigation: A Permanent Contribution to the Paris Agreement? (Norwegian International Climate and Forest Initiative, 2018).
Burke, PaulJ. Undermined by adverse selection: Australia’s direct action abatement subsidies. Econ. Pap. 35, 216–229 (2016).
Perera, O., Wuennenberg, L., Uzsoki, D. & Cuéllar, A. Financing Soil Remediation: Exploring the Use of Financing Instruments to Blend Public and Private Capital (International Institute for Sustainable Development, 2018).
Liagre, L., Lara Almuedo, P., Besacier, C. & Conigliaro, M. Sustainable Financing for Forest and Landscape Restoration: Opportunities, Challenges and the Way Forward (FAO, UNCCD, 2015).
Griscom, B. W. et al. Natural climate solutions. Proc. Natl Acad. Sci. USA 114, 11645–11650 (2017).
Sanderman, J. & Baldock, J. A. Accounting for soil carbon sequestration in national inventories: a soil scientist’s perspective. Environ. Res. Lett. 5, 034003 (2010).
Nave, L. E. et al. Reforestation can sequester two petagrams of carbon in US topsoils in a century. Proc. Natl Acad. Sci. USA 115, 2776–2781 (2018).
Nordhaus, W. Estimates of the social cost of carbon: concepts and results from the DICE-2013R model and alternative approaches. J. Assoc. Environ. Resour. Econ. 1, 273–312 (2015).
Smith, P. et al. in Climate Change 2014: Mitigation of Climate Change (eds Edenhofer, O. et al.) 811–922 (IPCC, Cambridge Univ. Press, 2014).
de Coninck, H. et al. in Special Report on Global Warming of 1.5 °C (eds Masson-Delmotte, V. et al.) Ch. 4 (IPCC, WMO, 2018).
Sanderman, J. et al. Carbon sequestration under subtropical perennial pastures I: overall trends. Soil Res. 51, 760–770 (2014).
Zomer, R. J., Bossio, D. A., Sommer, R. & Verchot, L. V. Global sequestration potential of increased organic carbon in cropland soils. Sci. Rep. 7, 15554 (2017).
Powlson, D. S. et al. Limited potential of no-till agriculture for climate change mitigation. Nat. Clim. Change 4, 678–683 (2014).
Roberts, K. G., Gloy, B. A., Joseph, S., Scott, N. R. & Lehmann, J. Life cycle assessment of biochar systems: estimating the energetic, economic, and climate change potential. Environ. Sci. Technol. 44, 827–833 (2010).
Lee, J. W., Hawkins, B., Li, X. & Day, D. M. in Advanced Biofuels and Bioproducts (ed. Lee, J. W.) 57–68 (Springer, 2013).
Conant, R. T., Paustian, K. & Elliott, E. T. Grassland management and conversion into grassland: effects on soil carbon. Ecol. Appl. 11, 343–355 (2001).
Toensmeier, E. The Carbon Farming Solution (Chelsea Green, 2016).
Kell, D. B. Breeding crop plants with deep roots: their role in sustainable carbon, nutrient and water sequestration. Ann. Bot. 108, 407–418 (2011).
McBratney, A., Koppi, T. & Field, D. J. Radical soil management for Australia: a rejuvenation process. Geoderma Reg. 7, 132–136 (2016).
Urban Biocycles (Ellen MacArthur Foundation, 2017).
Ryals, R., Hartman, M. D., Parton, W. J., DeLonge, M. S. & Silver, W. L. Long-term climate change mitigation potential with organic matter management on grasslands. Ecol. Appl. 25, 531–545 (2015).
Gravuer, K., Gennet, S. & Throop, H. L. Organic amendment additions to rangelands: a meta-analysis of multiple ecosystem outcomes. Glob. Change Biol. 25, 1152–1170 (2019).
Oldfield, E. E., Wood, S. A. & Bradford, M. A. Direct effects of soil organic matter on productivity mirror those observed with organic amendments. Plant Soil 423, 363–373 (2017).
Busch, J. et al. Potential for low-cost carbon dioxide removal through tropical reforestation. Nat. Clim. Change 9, 463–466 (2019).
Bastin, J.-F. et al. The global tree restoration potential. Science 365, 76–79 (2019).
IPCC Special Report on Global Warming of 1.5 °C (eds Masson-Delmotte, V. et al.) (WMO, 2018).
IPCC Special Report on Climate Change and Land (eds Shukla, P. R. et al.) (IPCC, 2019).
Don, A., Schumacher, J. & Freibauer, A. Impact of tropical land‐use change on soil organic carbon stocks—a meta‐analysis. Glob. Change Biol. 17, 1658–1670 (2011).
Powers, J. S., Corre, M. D., Twine, T. E. & Veldkamp, E. Geographic bias of field observations of soil carbon stocks with tropical land-use changes precludes spatial extrapolation. Proc. Natl Acad. Sci. USA 108, 6318–6322 (2011).
Bremer, L. L. & Farley, K. A. Does plantation forestry restore biodiversity or create green deserts? A synthesis of the effects of land-use transitions on plant species richness. Biodivers. Conserv. 19, 3893–3915 (2010).
Brockerhoff, E. G., Jactel, H., Parrotta, J. A., Quine, C. P. & Sayer, J. Plantation forests and biodiversity: oxymoron or opportunity? Biodivers. Conserv. 17, 925–951 (2008).
Erb, K.-H. et al. Exploring the biophysical option space for feeding the world without deforestation. Nat. Commun. 7, 11382 (2016).
Herrero, M. et al. Biomass use, production, feed efficiencies, and greenhouse gas emissions from global livestock systems. Proc. Natl Acad. Sci. USA 110, 20888–20893 (2013).
Li, Y. et al. Local cooling and warming effects of forests based on satellite observations. Nat. Commun. 6, 6603 (2015).
Poeplau, C. & Don, A. Carbon sequestration in agricultural soils via cultivation of cover crops—a meta-analysis. Agric. Ecosyst. Environ. 200, 33–41 (2015).
Chendev, Y. G. et al. in Soil Carbon Progress in Soil Science (eds Hartemink, A. E. & McSweeney, K.) 475–482 (Springer, 2014).
Wang, F. et al. Biomass accumulation and carbon sequestration in four different aged Casuarina equisetifolia coastal shelterbelt plantations in South China. PLoS ONE 8, e77449 (2013).
Sauer, T. J., Cambardella, C. A. & Brandle, J. R. Soil carbon and tree litter dynamics in a red cedar–scotch pine shelterbelt. Agrofor. Syst. 71, 163–174 (2007).
Tsonkova, P., Böhm, C., Quinkenstein, A. & Freese, D. Ecological benefits provided by alley cropping systems for production of woody biomass in the temperate region: a review. Agrofor. Syst. 85, 133–152 (2012).
Lu, Sen, Meng, P., Zhang, J., Yin, C. & Sun, S. Changes in soil organic carbon and total nitrogen in croplands converted to walnut-based agroforestry systems and orchards in southeastern Loess Plateau of China. Environ. Monit. Assess. 187, 688 (2015).
Oelbermann, M. et al. Soil carbon dynamics and residue stabilization in a Costa Rican and southern Canadian alley cropping system. Agrofor. Syst. 68, 27–36 (2006).
Ramankutty, N. & Foley, J. A. Estimating historical changes in global land cover: croplands from 1700 to 1992. Glob. Biogeochem. Cycles 13, 997–1027 (1999).
Murdiyarso, D., Hergoualc’h, K. & Verchot, L. V. Opportunities for reducing greenhouse gas emissions in tropical peatlands. Proc. Natl Acad. Sci. USA 107, 19655–19660 (2010).
Adams, J. M. & Faure, H. A new estimate of changing carbon storage on land since the last glacial maximum, based on global land ecosystem reconstruction. Glob. Planet. Change 16–17, 3–24 (1998).
Joosten, H. The Global Peatland CO 2 Picture (Wetlands International, 2009).
Nayak, D. et al. Management opportunities to mitigate greenhouse gas emissions from Chinese agriculture. Agric. Ecosyst. Environ. 209, 108–124 (2015).
Rosentreter, J. A., Maher, D. T., Erler, D. V., Murray, R. H. & Eyre, B. D. Methane emissions partially offset ‘blue carbon’ burial in mangroves. Sci. Adv. 4, 4985 (2018).
Mcleod, E. et al. A blueprint for blue carbon: toward an improved understanding of the role of vegetated coastal habitats in sequestering CO2. Front. Ecol. Environ. 9, 552–560 (2011).
Bouillon, S. et al. Mangrove production and carbon sinks: a revision of global budget estimates. Glob. Biogeochem. Cycles 22, GB2013 (2008).
Pendleton, L. et al. Estimating global ‘blue carbon’ emissions from conversion and degradation of vegetated coastal ecosystems. PLoS ONE 7, e43542 (2012).
Jardine, S. L. & Siikamäki, J. V. A global predictive model of carbon in mangrove soils. Environ. Res. Lett. 9, 104013 (2014).
Hamilton, S. E. & Friess, D. A. Global carbon stocks and potential emissions due to mangrove deforestation from 2000 to 2012. Nat. Clim. Change 8, 240–244 (2018).
Sanderman, J. et al. A global map of mangrove forest soil carbon at 30 m spatial resolution. Environ. Res. Lett. 13, 055002 (2018).
Griscom, B. W. et al. We need both natural and energy solutions to stabilize our climate. Glob. Change Biol. 25, 1889–1890 (2019).
This study was made possible by funding from the Craig and Susan McCaw Foundation.
The authors declare no competing interests.
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Bossio, D.A., Cook-Patton, S.C., Ellis, P.W. et al. The role of soil carbon in natural climate solutions. Nat Sustain (2020). https://doi.org/10.1038/s41893-020-0491-z