Every credible carbon standard asks the same question, which is whether this would have happened anyway, and each answers it through a similar battery of tests inherited from the Clean Development Mechanism. The differences are in emphasis and in how much discretion a project retains.
The Four Tests
| Test | The question | Where projects fail |
|---|---|---|
| Regulatory surplus | Is the activity already required by law? | Rules changed after project design |
| Investment analysis | Would it proceed without carbon revenue? | Standalone returns look healthy |
| Barrier analysis | What non-financial obstacles does finance remove? | Barriers asserted, not evidenced |
| Common practice | Is this already widespread locally? | Activity is the regional norm |
Most standards require a project to pass regulatory surplus plus at least one of the remaining tests, with common practice acting as a cross-check rather than a standalone hurdle.
Where the Standards Diverge
The substantive differences are three.
How prescriptive the investment test is. Some standards specify benchmark return rates and calculation methods; others accept a reasoned demonstration. Prescription reduces disputes and reduces flexibility.
Whether positive lists apply. Several standards maintain lists of activity types deemed automatically additional in specified contexts, which removes the test entirely for qualifying projects. Whether a project type appears on such a list can matter more than any argument it could construct.
How regulatory surplus handles future law. A project additional today may not be in five years if regulation expands. Standards differ on whether that is assessed once at validation or revisited at crediting period renewal, and in a jurisdiction reforming its carbon rules, that distinction has real consequences.
What Travels Across All of Them
Three things satisfy every standard's assessor.
Contemporaneous evidence, such as board papers, financing decisions, and feasibility studies dated before the project began, beats any retrospective narrative.
Conservative framing costs less in credibility than it costs in credits.
And transparent calculation lets an assessor check rather than trust, which is the difference between a finding and a clarification request.
Move beyond estimates
Verifiers test sampling design, uncertainty and whether a number traces back to the field. TREEO dMRV captures that evidence in real time, in one auditable chain.
