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Carbon Credits From the Ground Up: A Buyer's Guide to Soil Carbon and Regenerative Agriculture Projects

Carbon Credits From the Ground Up: A Buyer's Guide to Soil Carbon and Regenerative Agriculture Projects

The world's farmland is one of the largest carbon stores on Earth. For a century these lands have been net greenhouse gas emitters, but innovative carbon projects are beginning to change that.

When people picture a carbon removal project, they often picture trees or a machine pulling CO₂ from the air. They rarely picture a field of olive trees in Italy with a cover crop growing between the rows.

Yet the top two meters of the planet's soil hold roughly 2.5 trillion tonnes of carbon, more than the atmosphere and all living vegetation combined (Mongabay). Decades of plowing, bare fallows, and synthetic inputs have drawn that stock down. The practices that rebuild this carbon stock are well understood. Thankfully, they happen to make farms more productive and more resilient at the same time.

That is what an agricultural carbon project sells: a measured, verified increase in the carbon held in working farmland, plus the emissions avoided along the way. This guide explains how these projects work, how the carbon is actually measured, which standards certify the credits, and what a strong project looks like in practice, using the AgroEcology_Italy project (ICR-48) listed on Carbonmark as the worked example.

Key Takeaways

  • Agricultural carbon projects pay farmers to adopt practices that store carbon in soil and trees and cut on-farm emissions: cover crops, reduced tillage, agroforestry, managed grazing, organic amendments, and lower synthetic fertilizer use.
  • Most soil-carbon credits are removal credits, because the carbon moves from the atmosphere into soil organic matter, but projects also generate reductions from lower fertilizer and fuel use.
  • Measurement is the hard part. Credible projects combine physical soil sampling with calibrated models, satellite monitoring, and conservative discounts, and the leading standards now require direct measurement for their highest labels.
  • The main certification routes are Verra's VM0042 (v2.2 approved for the ICVCM's Core Carbon Principles label in October 2025), Gold Standard's Soil Organic Carbon Framework, ISO 14064-2 projects issued through the International Carbon Registry, ISO 14064-2 projects issued directly onchain through Carbonmark Direct, Australia's ACCU Soil Carbon Method, and the EU's new carbon-farming certification methodologies.
  • Permanence is the honest caveat. Soil carbon can be released if practices stop or the climate warms, so buffer pools, long contracts, and ongoing monitoring matter as much as the headline tonnage.
  • You can buy and retire soil-carbon credits yourself on the Carbonmark Marketplace, from 1 kg upward, paying by card, with a public on-chain retirement certificate as proof.

What are Agricultural Carbon Projects?

An agricultural carbon project is a program that changes how land is farmed so that it stores more carbon and emits less, then measures the difference and issues credits for it.

The mechanism is photosynthesis with a long tail. Plants pull CO₂ from the air and push a share of that carbon below ground through roots, root exudates, and crop residue. Soil microbes and fungi convert some of it into soil organic carbon (SOC): stable organic matter bound to minerals and aggregates, where it can persist for decades to centuries. Every extra tonne of SOC in a field is a tonne of carbon that is no longer in the atmosphere.

Farming can run that process in either direction. Frequent plowing exposes organic matter to oxygen and accelerates its decomposition. Bare soil between crops means months with no photosynthesis feeding the soil at all. Regenerative practices reverse both: keep the ground covered, disturb it as little as possible, and add diversity above and below ground.

Agricultural projects therefore produce two kinds of climate benefit and it's worthwhile to understand which type you are buying:

OutcomeWhat happensCredit type
Soil organic carbon increaseCarbon moves from the atmosphere into soil organic matterRemoval
Biomass carbon in trees and perennialsAgroforestry, hedgerows, orchards, and vineyards store carbon in wood and rootsRemoval
Lower nitrous oxide (N₂O) emissionsLess synthetic nitrogen fertilizer means less N₂O, a greenhouse gas about 273 times as potent as CO₂ over 100 years under IPCC AR6Reduction
Lower fuel and input emissionsFewer tillage passes and fewer chemical applicationsReduction

The Practices That Put Carbon Back

The practices themselves are neither new nor exotic. What is new is paying for the measured outcome and delivering more financing to farms that implement these climate-friendly initiatives.

PracticeHow it stores carbon or cuts emissionsCo-benefits farmers notice first
Cover crops and year-round vegetationKeeps photosynthesis feeding the soil between cash crops; roots add carbon and protect against erosionWater retention, weed suppression, less erosion
No-till or minimum tillageAvoids oxidizing organic matter; preserves soil structure and fungal networksLower fuel and labor costs
Agroforestry and silvopastureTrees, shrubs, and hedgerows integrated into crops or pasture store carbon in wood and deep rootsShade, windbreaks, diversified income (fruit, nuts, timber)
Managed rotational grazingRest periods let grasses regrow and deepen root systems, building soil organic carbon (SOC) in pasturesBetter forage, drought resilience
Compost and organic amendmentsAdds stable carbon directly and feeds soil biologyFertility, reduced input spend
Optimized or reduced synthetic nitrogenCuts N₂O emissions and the upstream footprint of fertilizer manufactureLower costs, cleaner water
Perennial and tree cropsLong-lived orchards, olive groves, and vineyards keep soil undisturbed for decadesStable long-term yields

A serious project rarely relies on one practice. Many carbon project methodologies in this category include reduced tillage, fertilizer optimization, residue and water management, cover cropping, and grazing changes as eligible, and the strongest projects stack several. The AgroEcology_Italy project, which we return to below, requires each participating farm to adopt at least three approved regenerative practices selected from a protocol of thirteen (Alberami).

The Technology Behind the Claim: How Soil Carbon Is Measured

Current methodologies and verification technologies are all working toward better soil carbon measurement. At the project level, though, one fact remains: soil carbon is real, but it is hard to count. It varies from one end of a field to the other, it changes slowly, and the annual gain is small relative to the total stock already there. A project claiming a gain of a few tonnes per hectare per year is trying to detect a change of well under one percent in a very large, noisy number.

The credible response is not to give up on measurement. It is to combine several tools and discount for what they cannot resolve.

1. Physical soil sampling

The gold standard is still a soil core sent to a laboratory. Cores are taken to a set depth (often 30 cm, ideally deeper), and the carbon content is measured by dry combustion or increasingly by infrared spectroscopy, which is faster and cheaper per sample. Verra's CCP-labeled version of VM0042 v2.2 lists exactly these techniques as the accepted basis for measurement (Verra). Sampling design matters just as much: stratified, randomized sampling that captures a field's variability is what makes the result defensible.

2. Process-based models

Because sampling every field every year is expensive, methodologies allow biogeochemical models such as DayCent, DNDC, RothC, and Century to estimate SOC change from weather, soil type, and management data. The catch is that models are only as good as their calibration.

3. Remote sensing and digital tools

Though satellites cannot see carbon 30 cm underground, they can verify what farmers are doing: whether a cover crop is growing, whether a field was tilled, how much biomass is present, and whether trees planted in year one are still standing in year ten. That makes remote sensing the backbone of practice verification and additionality checks at scale. Field-level IoT sensors add soil moisture and temperature data that improve model inputs. Digital soil mapping, which uses machine learning to interpolate carbon stocks across landscapes from sparse samples and satellite covariates, is promising but not yet fully accepted: the ICVCM explicitly excluded it from the CCP label for VM0042 pending further assessment (ICVCM).

4. Conservative accounting

Every reputable methodology layers discounts on top of the measurement: buffer pools that withhold a share of credits against future reversals, uncertainty deductions when confidence intervals are wide, and in some cases a permanence discount for shorter commitment periods. Australia's 2021 soil-carbon method, for example, applies a 20% discount to projects choosing a 25-year permanence period, a 5% reversal buffer, and withholds 25% of credits after the first sampling round until gains are confirmed (Clean Energy Regulator).

Which Standards Certify Soil-Carbon Credits?

Six certification routes matter for a buyer in 2026. They differ in geography, in how much they rely on measurement versus modeling, and in how long they hold the land to its commitment.

Standard / methodologyRegistryGeographyKey features
VM0042 Improved Agricultural Land Management, v2.2Verra (VCS)GlobalReductions and removals; measure-and-model or measure-and-remeasure; approved for the ICVCM Core Carbon Principles (CCP) label on 30 October 2025, with direct SOC measurement required (digital soil mapping excluded)
Soil Organic Carbon Framework MethodologyGold StandardGlobalPractice-based framework with modeling guidelines; 20% buffer contribution for sequestration activities
ISO 14064-2 projectsInternational Carbon Registry (ICR)GlobalEach project's methodology is validated against ISO 14064-2 by an accredited verification body rather than pre-approved by the registry; ICR received ICROA endorsement in January 2025
ISO 14064-2 projects, direct issuanceCarbonmark Direct (onchain)GlobalFor projects whose methodology is validated and verified against ISO 14064-2 by an accredited VVB but is not hosted on a traditional registry; credits are issued directly onchain as CMARK tokens, each carrying a public identifier tied to its project and vintage
Soil Carbon Method (2021)Australian ACCU SchemeAustraliaMeasurement-based or hybrid; independent sampling; 25- or 100-year permanence; first credits issued June 2023
CRCF carbon-farming methodologiesEU certification schemesEuropean UnionCertification methodologies for agriculture and agroforestry on mineral soils, peatland rewetting, and afforestation adopted July 2026 under the EU Carbon Removals and Carbon Farming Regulation

Two developments deserve emphasis.

First, the ICVCM's October 2025 decision was the first time any sustainable-agriculture methodology earned the CCP label. The Integrity Council estimated that VM0042 v2.2 projects could generate around 126 million credits per year once registered (ICVCM). Soil carbon has moved from the experimental fringe to a category with an integrity benchmark.

Second, the EU's Carbon Removals and Carbon Farming Certification Framework (CRCF) now has methodologies for the carbon-farming track. The Commission adopted them in July 2026, covering "catch crops, cover crops, conservation tillage," agroforestry "practices that integrate trees, shrubs or hedgerows within crop or grazing systems," and improved fertilizer efficiency (European Commission). For European projects like the one below, that creates a public certification route alongside the voluntary standards.

What About ISO 14064-2?

Several projects on Carbonmark, including the AgroEcology_Italy project, are certified under ISO 14064-2 through the International Carbon Registry. It is worth understanding what that means.

ISO 14064-2 is the international standard that specifies how to quantify, monitor, and report greenhouse gas reductions or removal enhancements at the project level. It sets requirements for baseline selection, additionality reasoning, monitoring, and uncertainty. It is not itself a methodology; it is the rulebook a methodology has to satisfy.

The ICR, founded in Iceland in 2020, builds its program on ISO standards for projects, validation, and verification, and issues credits to projects that conform to both ISO 14064-2 and ICR's own requirements (ICR). Unlike Verra or Gold Standard, ICR does not pre-approve a fixed list of methodologies. Instead, an accredited validation and verification body (VVB) assesses each project's methodology against ISO 14064-2 at validation. The flexibility lets projects combine elements of existing methodologies where none fits perfectly. The trade-off is that a buyer should read the project's validation report to see which quantification approach was actually used. ICROA's endorsement of ICR in January 2025, at which point the registry hosted 121 projects supported by 20 VVBs, added an external quality check to the program (ICROA).

The same standard underpins a second route. Through Carbonmark Direct, a project whose methodology has been validated and verified against ISO 14064-2 by an accredited VVB can issue its credits directly onchain, with no traditional registry in between. Each credit carries a public identifier tied to its project and vintage, so the issuance and retirement trail is as traceable as an ICR-issued credit. The route exists for projects whose methodologies existing registries do not yet support.

Carbon Permanence: The Question Every Buyer Should Ask

Soil carbon is durable, not permanent. Carbon that took ten years to build can leave in two if a field returns to intensive tillage. Warming is a second threat: in a long-running Harvard Forest experiment, plots heated by 5°C lost 17% of the carbon in the top 60 cm of soil over 26 years (Mongabay).

This is why the design of the commitment matters as much as the science. The features to look for:

  • Contract length. Farmers should be bound to maintain practices for a defined period (the AgroEcology_Italy project uses 15- to 45-year contracts; Australia offers 25 or 100).
  • Buffer pool. A share of credits held back, typically 10 to 20%, that can be canceled if a reversal occurs.
  • Ongoing monitoring. Satellite verification that practices continue after credits are issued, with the ability to detect a return to tillage.
  • Farmer economics that make quitting irrational. A project that pays farmers a real share of revenue and lowers their input costs is more likely to hold than one that pays a token fee.

The Market Is Maturing

Two years ago soil carbon was, in the words of Boomitra CEO Aadith Moorthy, in "the trough of disillusionment" (Trellis). The issuance data since then tells a different story.

  • Indigo Ag issued 1.1 million soil-carbon credits in February 2026 from U.S. croplands, taking its cumulative total past 2 million tonnes. In January 2026 Microsoft signed a 12-year agreement to buy 2.85 million of Indigo's soil-carbon removal credits (CarbonCredits.com).
  • Verra's first VM0042 issuance in Asia came from Grow Indigo's Aadi project in Punjab and Haryana, India: more than 50,000 credits from roughly 30,000 acres of smallholder farms (Indigo Ag).
  • Australia's first credits under the 2021 soil-carbon method, more than 150,000 ACCUs across two Queensland grazing projects, were issued in June 2023 (Clean Energy Regulator).
  • Pricing reflects the measurement burden: Indigo's U.S. credits have traded in the $60 to $80 per tonne range, well above most avoidance credits (Trellis).

Soil carbon is now a carbon project category with methodologies that have CCP approval, a corporate anchor buyer, and issuances counted in the millions. The remaining question for most buyers is which project they should integrate into their offsetting portfolios.

Case Study: The AgroEcology_Italy Project (ICR-48)

The AgroEcology_Italy project, listed on Carbonmark and operated by Radica, is a good illustration of what a carefully built regenerative-agriculture project looks like in a European context.

Origins in a crisis

The project was developed by Alberami, a Lecce-based benefit corporation that has since rebranded as Radica (Radica). Its founder, Francesco Musardo, started the company in response to the Xylella fastidiosa bacterium that has devastated the olive groves of Puglia's Salento peninsula. His diagnosis was that the epidemic exposed a deeper problem, degraded soils and ecosystems, and that regenerating the land was the durable answer (The Good in Town).

What the farms do

Participating farms in 15 regions of Italy, including Puglia (the municipalities of Ostuni, Fasano, Monopoli, and Carovigno), commit to a regenerative protocol. As per the project's documentation and Carbonmark project page, the practices include:

  • Minimal or zero tillage
  • Year-round vegetation cover using spontaneous growth or cover crops
  • Intercropping and agroforestry
  • Organic farming principles
  • Optimized or reduced synthetic fertilizer use
  • Planting new perennial crops: vineyards, orchards, and olive groves

Farmers sign a 15- to 45-year contract, with a minimum of 3 hectares for tree crops or 10 hectares for arable land, and must adopt at least three approved regenerative practices from the developer's list of thirteen. There are no upfront costs to the farmer, and up to 75% of the revenue from credit sales goes to the farm. That revenue share is the project's permanence mechanism in economic form.

How the carbon is counted

The project is certified under ISO 14064-2 on the International Carbon Registry (ICR), independently validated by the accredited auditor Earthood, and was registered on ICR on 15 July 2024 (ICR). Its monitoring combines soil sampling and laboratory analysis, satellite data, IoT sensors, and geochemical modeling, with conservative factors applied to avoid over-crediting. A corporate buyer's published account of its purchase describes the project's methodology as drawing on established approaches including Verra's VM0042 and the VMD0053 companion module, with a 10% buffer of credits withheld against losses and a further 10% released to farmers only after year six on verified compliance (Miccolis).

In November 2024 the ratings agency BeZero Carbon assigned the project a BBB rating (The Good in Town), currently the top-ranked agricultural soil-carbon project on BeZero. Radica is targeting an A rating at the next rating cycle.

Scale and co-benefits

The project has a 45-year crediting period that began in 2022. The developer's current figures are 35,000+ hectares under management, 750+ producers in its network, and 84,000 tCO₂e verified ex-post for 2022–2025. The project maps to eight UN Sustainable Development Goals: 1, 2, 8, 9, 12, 13, 15, and 17, from poverty reduction and food security to climate action and life on land.

For a buyer, the appeal is concrete. This is a removal credit from a European project with a physical MRV stack, a third-party rating, a 15- to 45-year farmer commitment, and a revenue model that gives the farmer a reason to keep the practices in place. It is not a perfect credit, because no soil-carbon credit is. It is a materially good one.

How to Buy and Retire Soil-Carbon Credits on Carbonmark

The Carbonmark Marketplace is self-service from first search to final certificate, with options for SMEs and large businesses as well as software companies looking to more deeply integrate offsetting into their products.

  1. Go to the Marketplace and filter by project type: Agriculture, or by registry (ICR) if you want to browse ISO 14064-2 projects specifically. You can also filter by country, vintage, price, and the UN SDGs a project supports.
  2. Open the project page. Every listing shows the methodology, location, available vintages, current price, and a description of the practices. For soil carbon, this is where you check how the carbon was measured.
  3. Choose your quantity. Purchases start at 0.001 tonnes (1 kg), so a small business can retire exactly its residual footprint, and a large one can buy in bulk.
  4. Enter a beneficiary name and retirement message. This is the name the retirement is recorded under, permanently, on a public ledger.
  5. Pay by card. Checkout is powered by Stripe, so it works like any online purchase.
  6. Receive your certificate. The retirement executes on-chain within seconds and you get a retirement certificate with a public transaction link that anyone can verify. ICR, Puro.Earth, and EcoRegistry-issued credits provide a registry-based retirement certificate on a 1:1 basis with retirements executed on our platform.

If you want a broader walk-through of choosing between project types, our step-by-step buying guide and our guide to nature-based projects cover the wider Marketplace.

One more thing about the claim you make afterward. Precision earns trust:

❌ "We're carbon neutral thanks to regenerative farming."

✅ "We reduced our operational emissions by 22% this year and retired 45 tonnes of verified soil-carbon removal credits from the AgroEcology_Italy project against the remainder. Here is the certificate."

The Ground Beneath the Transition

Agriculture is often described as a climate problem. It is also one of the few sectors where the fix pays the people doing the work, improves the asset they depend on, and starts working the season it is adopted.

Soil-carbon credits are how a company in another country can help finance that shift on a farm in Puglia, or Punjab, or Queensland, and receive a measured, verified, publicly recorded tonne in return. The measurement is harder than for a wind farm. The permanence needs watching. The standards are still tightening. But the category has crossed from promising to proven, with an integrity label, anchor buyers, and millions of tonnes issued.

The carbon is waiting in the air. The fields are waiting for the practices. What connects them is finance that is transparent enough to trust. That is what Carbonmark is built to provide.

Frequently asked questions

What are soil carbon credits?

Soil carbon credits represent one tonne of CO₂e removed from the atmosphere and stored as soil organic carbon, or avoided through lower on-farm emissions, as a result of changed agricultural practices such as cover cropping, reduced tillage, agroforestry, and managed grazing. They are issued by carbon standards after a third party verifies the measured change.

Are soil carbon credits removals or avoidance credits?

Mostly removals. The increase in soil organic carbon and in tree biomass is a transfer of carbon from the atmosphere into land, which registries label as a removal. The same projects usually also generate reduction credits from lower nitrous oxide and fuel emissions, and the registry issuance record shows which is which.

How is soil carbon measured for carbon credits?

Credible projects take physical soil cores and analyze them by dry combustion or infrared spectroscopy, then use calibrated biogeochemical models such as DayCent or RothC to estimate change between sampling rounds. Satellites verify that practices are actually in place, and methodologies apply buffer pools and uncertainty discounts to keep issuance conservative. The ICVCM's Core Carbon Principles label for VM0042 requires direct measurement rather than modeling alone.

Which standards certify agricultural carbon credits?

The main routes are Verra's VM0042 Improved Agricultural Land Management methodology, Gold Standard's Soil Organic Carbon Framework, ISO 14064-2 projects issued through the International Carbon Registry, ISO 14064-2 projects issued directly onchain through Carbonmark Direct, Australia's ACCU Soil Carbon Method, and the European Union's carbon-farming certification methodologies adopted in 2026 under the CRCF regulation.

How permanent is soil carbon?

Soil carbon can persist for decades to centuries, but it can be lost if a field returns to intensive tillage or if warming accelerates decomposition. Good projects manage this with long farmer contracts (15 to 100 years depending on the standard), buffer pools of withheld credits, ongoing satellite monitoring, and revenue-sharing that gives farmers a lasting reason to maintain the practices.

Can I buy soil carbon credits directly as a small business or individual?

Yes. On the Carbonmark Marketplace you can filter for agriculture projects, buy from 1 kg upward, pay by card through Stripe, and receive a public on-chain retirement certificate within seconds. No broker, minimum order, or crypto wallet is required.

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