The voluntary carbon market entered 2025 carrying real scar tissue from a difficult two years. High-profile investigations into forest carbon projects, methodological criticism from academic researchers, and a sharp correction in voluntary credit prices created conditions where many farmers who'd been promised carbon revenue found themselves waiting, or discovered their program credits weren't selling. The soil carbon segment was not immune to that turbulence — but its underlying fundamentals are distinct from the project types that drew the most criticism.
What Actually Happened in 2023–2024
The voluntary carbon market's credibility crisis in 2023–2024 was concentrated in avoided deforestation credits, particularly REDD+ projects, where independent researchers found significant overcounting of threatened deforestation baselines. The criticism was methodologically specific: baseline scenarios that assumed unrealistically high deforestation rates produced inflated credit quantities that didn't correspond to actual emissions reductions.
Soil carbon projects were caught in the reputational fallout, but the methodological critique doesn't apply equally. Soil carbon sequestration is a direct measurement of carbon added to a physical medium — it's quantifiable, it's physical, and it's verifiable through independent resampling. The challenge isn't baseline overcounting in the way REDD+ faced it; it's measurement precision and permanence. Those are real challenges, but they're tractable ones.
What did hurt soil carbon specifically: several early programs that had enrolled large acreages at favorable terms were using model-based SOC estimation (IPCC Tier 1 or 2 factors) rather than direct measurement. As buyer scrutiny intensified, credits from those programs became harder to sell at their original price points. This created a bifurcation in the market between measurement-backed credits and model-estimated credits — a gap that will likely widen.
The Price Picture in 2025
Voluntary soil carbon credit prices vary substantially by methodology quality, registry backing, and co-benefit attributes. Nature-based solutions broadly trade in a wide range depending on project type and vintage year, with higher-quality soil credits from verified projects trading at a premium. Buyers distinguishing between methodology tiers has become more common — sustainability teams that were less discriminating in 2021–2022 are now asking for verification statements and protocol documentation before committing to large purchases.
For Midwest regenerative agriculture specifically, the relevant market is primarily the voluntary market through Verra VCS, Gold Standard, or the Climate Action Reserve (CAR) Soil Enrichment Protocol. Compliance markets — California's cap-and-trade system under ARB — are accessible in principle for soil carbon projects but involve substantial upfront protocol requirements that are economically challenging for smaller farm operations without aggregator support.
The practical price range that Midwest growers can reasonably expect for measurement-backed, verification-ready soil carbon credits in 2025 falls in the range where the economics support a meaningful supplemental income for farms practicing cover crops, no-till, and diversified rotations — but it's not a replacement for crop revenue on its own. The per-acre carbon payment is additive income, not a hedge against commodity price swings.
What Growers Need to Know About Program Selection
The market has consolidated around a smaller number of aggregators and MRV platforms since the 2021–2022 rush of new entrants. Several programs that launched without clear methodology or buyer relationships have quietly stopped enrolling farms. This is actually positive for growers evaluating new enrollment: there's less noise, and the programs still active tend to have clearer answers to the basic questions.
Those questions should include:
- What MRV methodology is being used? Model-only estimates versus direct measurement represent a significant difference in credit quality. Ask specifically whether the program uses physical soil sampling or relies on modeled estimates from management practice data.
- Which registry will the credits be issued to? Verra VCS and Gold Standard registries maintain public credit issuance records that buyers can independently verify. Programs that issue to proprietary or unlisted registries carry more counterparty risk.
- Who owns the data? Some programs claim broad rights to farm-level soil data as a condition of enrollment. For farms participating in multiple data programs (crop insurance, USDA programs, state conservation programs), data ownership terms deserve careful review.
- What is the commitment period and reversal liability? Most soil carbon protocols require a minimum 10-year commitment to enrolled management practices. Permanence buffer pools protect buyers against reversals, but grower liability terms vary across programs.
We're not saying every carbon program is equally risky. We're saying that the farms that will generate the most durable carbon revenue are those enrolled in programs where measurement quality is verifiable and buyers can independently confirm credit integrity.
The Midwest Advantage
Iowa, Illinois, Minnesota, and Indiana sit atop some of the deepest, carbon-rich prairie soils on Earth — Mollisols developed over millennia under tallgrass prairie that regularly deposited organic matter to depths of 1.5 meters or more. Intensive row-crop agriculture since the mid-20th century has reduced SOC levels substantially from their pre-cultivation highs in many areas, which means the regenerative opportunity — the gap between current SOC and what these soils can hold — is real and measurable.
The flip side is that these soils are already relatively high in organic matter compared to degraded tropical soils, which means marginal SOC accumulation rates per year under regenerative management are measured in tenths of a percent, not whole percentage points. That's not a flaw; it's an accurate reflection of how carbon sequestration works in temperate agricultural soils. Growers and buyers both benefit from understanding realistic sequestration rates rather than projections calibrated to generate headline-grabbing numbers.
Corporate Buyer Trends in 2025
The corporate buyer landscape has matured meaningfully. The SBTi (Science Based Targets initiative) guidance has created more structure around what categories of offsets can be claimed against near-term scope 1/2 targets versus residual emissions. Nature-based carbon credits, including soil carbon, are increasingly positioned as contributions to corporate land-sector and supply chain decarbonization rather than as direct substitutes for scope 1/2 reductions — a framing that's actually more accurate to what soil carbon sequestration represents.
For buyers with agricultural supply chains — food companies, agrochemical companies, commodity traders — soil carbon credits from their supply shed carry co-benefit narratives around supply chain sustainability and soil health that are meaningful beyond the tonne count. Several regional buyers are specifically seeking to source credits from farms in their procurement geography, creating a local market dynamic that can support better pricing than the anonymous commodity market.
The farms best positioned to take advantage of that dynamic are those enrolled in programs that produce credit packages with detailed geographic and methodological provenance — documentation specific enough that a buyer can trace the credit to a specific field, a specific sampling campaign, and a specific verification event. That traceability is what distinguishes a premium soil carbon credit from a commodity credit, and it's what the market will increasingly demand.
Amara Diallo is the founder and CEO of Terrabit, based in Iowa City, Iowa. For farm enrollment inquiries or buyer discussions, contact [email protected].