Soil carbon management influences climate mitigation by changing how much carbon is stored in soils versus released to the atmosphere. Soil carbon constitutes a major terrestrial reservoir of organic matter and acts as both a sink and source of CO2 depending on land use and management. Rattan Lal, Ohio State University, has emphasized that maintaining and increasing soil organic carbon improves resilience, while the Intergovernmental Panel on Climate Change reported that terrestrial management can contribute to limiting global warming when combined with deep emissions reductions.
How carbon is stored and lost
Soil stores carbon in living roots, dead plant material, and stabilized organic matter bound to minerals. Disturbances such as intensive tillage, drainage of wetlands, and conversion of native ecosystems accelerate microbial decomposition, releasing CO2 and in some cases nitrous oxide. Pete Smith, University of Aberdeen, has highlighted that the potential to increase soil carbon varies by climate, soil type, and past land use, making gains more achievable in degraded lands than in already carbon-rich soils. This variability matters for realistic policy targets and avoids overpromising on sequestration.
Practices, limits, and trade-offs
Practices that build soil carbon include reduced or no-till, cover cropping, diversified rotations, agroforestry, and restoration of wetlands and grasslands. Rattan Lal and the Food and Agriculture Organization have discussed co-benefits such as improved water retention, crop yields, and biodiversity that often accompany soil carbon gains. However, Robert B. Jackson, Stanford University, and other researchers warn about trade-offs where increased fertilizer use to boost biomass can raise nitrous oxide emissions, undermining climate benefits. The Intergovernmental Panel on Climate Change further notes that many soil carbon gains are reversible if management is not sustained, introducing a significant reversal risk.
Measurement and governance determine whether soil carbon management meaningfully contributes to mitigation. Robust monitoring, reporting, and verification systems are required to translate improved practices into credible carbon credits or national inventory changes. Cultural and territorial nuances matter because adoption depends on land tenure, local knowledge, and economic incentives; interventions that work in temperate commercial farms may not be appropriate for smallholder or indigenous systems.
When aligned with strong emission reductions, improved soil management is a complementary climate strategy that also supports food security and ecosystem health. Its true contribution depends on realistic assessment of regional potential, long-term stewardship, and policies that recognize both environmental and social dimensions.