What does a VCS methodology actually do?
A VCS methodology sets out how a specific type of project quantifies its emission reductions or removals: which carbon pools to count, how to set a baseline, what to monitor, and how to handle uncertainty and leakage. It also sets applicability conditions, which decide whether a given project may use it at all.
The applicability conditions are the part to read first and the part most often read last. They are where a project discovers that its land, its activity or its start date puts it outside the methodology — a discovery that is cheap in week one and expensive during validation.
How do you choose between the land-based methodologies?
The choice follows from what is physically happening on the land. Planting trees where there was no forest is afforestation or reforestation. Protecting forest that would otherwise be cleared is avoided deforestation. Restoring a mangrove is tidal wetland restoration. Changing how existing farmland is managed is agricultural land management. Lengthening a harvest cycle is improved forest management. Two of those activities — avoided deforestation and improved forest management — are served by several methodologies rather than one, so the activity narrows the choice without always settling it.
| Methodology | Covers | Typical project |
|---|---|---|
| VM0047 | Afforestation, reforestation and revegetation | Planting on degraded or non-forest land; agroforestry |
| VM0033 | Tidal wetland and seagrass restoration | Mangrove restoration; salt marsh; seagrass |
| VM0048 | Reduced emissions from deforestation and degradation | Protecting forest under clearing pressure |
| VM0006 | Mosaic and landscape-scale REDD | Deforestation spread across a settled landscape |
| VM0007 | REDD+ framework, used with separate modules | Multi-activity REDD+ projects assembled from modules |
| VM0015 | Avoided unplanned deforestation | Halting agent-driven clearing; transitioning to VM0048 |
| VM0042 | Improved agricultural land management | Practice change on working farmland; soil carbon |
| VM0003 | Improved forest management, rotation age | Lengthening the harvest cycle in managed forest |
| VM0010 | Improved forest management, logged to protected | Ending harvest in previously logged forest |
| VM0034 | Canadian forest carbon, several activities | Forestry projects located in Canada |
Projects frequently sit near a boundary — agroforestry on farmland could resemble ARR or agricultural land management depending on what is planted and where. That is a question the applicability conditions answer, and it is worth answering before the monitoring design is fixed, because the two methodologies ask for different evidence.
Four methodologies cover avoided deforestation. Which applies?
VM0048 is the consolidated REDD methodology and the starting point for a new avoided-deforestation project. The three older methodologies remain active and still govern registered projects: VM0006 for mosaic and landscape-scale deforestation, VM0007 as a modular REDD+ framework used with separate modules and tools, and VM0015 for unplanned, agent-driven deforestation. Verra requires projects using them for unplanned deforestation activities to move to VM0048, so the older three describe an existing portfolio more often than a new design.
The transition is not a fixed calendar date; it is triggered by the deforestation risk map for a project's region and takes effect at a verification. Because moving to VM0048 also resets the baseline, it changes the credit numbers rather than only the paperwork. The Verra REDD+ methodologies and the VM0048 transition sets out how the three older methodologies differ and what triggers the move.
What do all of them require, whichever you choose?
Every land-based methodology asks the same underlying questions, which is why the measurement layer can be built before the methodology is finally settled. Each wants a defined project boundary, a defensible baseline, evidence of additionality, monitoring over time that is traceable to specific places and dates, and independent verification of what is claimed.
That commonality is worth exploiting. A project capturing well-structured, location-bound field evidence keeps its options open between methodologies and between standards; a project with weak evidence is constrained under all of them. See forest carbon monitoring and what digital MRV is.