We were asked a question that sounds binary and is not: is the Cool Farm Tool eligible for quantifying farm-level emissions under Verra VM0042 and a SustainCERT-verified value chain intervention? Working through it clause by clause produced a more useful answer than yes or no. Eligibility attaches to emission sources, not to software.
Why the Question Is Framed Wrongly
VM0042 does not maintain a list of approved tools. It defines three quantification approaches and applies them source by source:
| Approach | Method | Applies to |
|---|---|---|
| 1. Measure and Model | Calibrated process-based biogeochemical model (DayCent, DNDC) | SOC, direct N₂O/CH₄ fluxes |
| 2. Measure and Re-Measure | Direct field measurement, repeated | SOC stock change only |
| 3. Default Factors | IPCC or equivalent default factors on monitored activity data | Fossil fuel CO₂, liming, fertiliser N₂O |
The Cool Farm Tool is a calculation engine, not a standard. Ask whether it is "approved" and there is no answer. Ask whether its arithmetic for a given source matches what VM0042 requires for that source, and the answer becomes checkable.
Where It Lines Up Cleanly
For fossil fuel combustion, VM0042 Section 8.2.3 multiplies fuel consumed by an emission factor. CFT's Field Energy Use module performs exactly that operation with the same structure.
That is a genuine match, the tool is operationalising the methodology's own equation rather than substituting a different model. The conditions are narrow but achievable: the emission factors used must come from the IPCC 2019 Refinement rather than CFT's built-in defaults, and the activity data must be monitored as the methodology requires.
Under those conditions, CFT output for fuel combustion supports what the framework calls a top-down approach: an endorsed methodology applied in full, with the tool doing the arithmetic.
Where It Diverges
Soil carbon is a different matter.
CFT estimates SOC change using an IPCC Tier 1 method with a 20-year transition rule, derived from the Ogle et al. stock-change factor approach. That is a legitimate, widely-used method. It is not what VM0042 asks for under Approach 1, which specifies a calibrated process-based model, nor Approach 2, which specifies repeated measurement.
So CFT's SOC output does not slot into VM0042's soil carbon pathway. Using it there moves the project into bottom-up territory, a bespoke approach assessed case by case against the general GHG accounting principles, with a correspondingly heavier justification burden.
The same reasoning applies to N₂O. CFT uses an empirical multivariate regression derived from a large global dataset, which is more sophisticated than IPCC Tier 1 and different from it. More sophisticated is not automatically more eligible; it is differently eligible, and it has to be argued.
The Practical Shape of the Answer
| Emission source | CFT usable? | Approach it supports |
|---|---|---|
| Fossil fuel combustion | Yes, with IPCC 2019 factors | Top-down |
| Liming | Yes, same logic | Top-down |
| Fertiliser N₂O | Possible, requires justification | Modified top-down / bottom-up |
| Soil organic carbon | Not into VM0042's SOC pathway | Bottom-up if used at all |
This is a more useful result than a blanket ruling, because it tells a programme where it can move fast and where it must slow down. Phase 1 data collection, including activity data, fuel, inputs, and baseline practice, is exactly where CFT is strongest and where the eligibility case is cleanest.
Why Tool Choice Is Really About Data Burden
The deeper finding from the review had little to do with equations. CFT's advantage is that it asks for things farmers actually know: litres of fuel, tonnes of fertiliser, livestock numbers, tillage practice.
Professional LCA software can model the same system more flexibly and demands inputs and expertise that a smallholder programme cannot realistically supply at scale. A quantification approach that is theoretically superior and practically uncollectable produces worse numbers than a simpler one with complete data.
That trade-off, specifically model sophistication against data completeness, is the actual decision. The eligibility analysis just tells you which combinations are permitted.
What We Recommended
Use CFT where its arithmetic matches the methodology's, source by source, with factors swapped to the required IPCC values. Do not use it as the basis of an SOC claim under VM0042. Document the source-by-source mapping explicitly in the design document, because a verifier assessing "we used the Cool Farm Tool" has been given nothing to check, while one assessing "fuel CO₂ via Approach 3 with IPCC 2019 factors, calculated in CFT" has been given everything.
Check the land before you commit
Eligibility turns on land history and forest cover at a cut-off date. TREEO Eligibility runs satellite-based forest cover detection on your area of interest, before a single seed goes into the ground.
