Carbon Standards for Nature Projects Compared, from Verra to Plan Vivo
Compare Verra, Gold Standard, Plan Vivo, ACR, Climate Action Reserve, Isometric and ART by project type, monitoring rules, fees and ICVCM status.
Choosing a carbon standard decides more than where your credits are listed. It decides how you measure trees, how often a verifier visits, how long you commit to monitoring and what the paperwork costs. This guide compares the standards that certify nature-based projects: reforestation (ARR), agroforestry, improved forest management (IFM), REDD+ and blue carbon.
It is a comparison of published rules, not legal or investment advice. Standards change their documents often, so every row links the first-party source. First-party documents checked October 17, 2026.
Compare the main standards
| Standard | Run by | Nature project types | Best known for |
|---|---|---|---|
| Verra, US nonprofit | ARR, IFM, REDD+, wetlands, grasslands, agricultural land | The largest volume of nature credits; any country, any scale | |
| Gold Standard Foundation, Switzerland | Afforestation/reforestation, agriculture, mangroves | Sustainable-development co-benefits alongside carbon | |
| Plan Vivo Foundation, UK charity | Smallholder and community forestry, agroforestry | Community-led projects; most credit income goes to participants | |
| Winrock International | A/R of degraded lands, US and Canadian IFM, wetlands | North American forestry; also serves compliance markets | |
| Climate Action Reserve, US nonprofit | US forests; Mexican community forests | 100-year permanence in the US; ejido-led projects in Mexico | |
| Isometric, UK/US | Reforestation, agroforestry, mangroves, IFM | Removal-only crediting with a satellite control baseline | |
| Winrock International | Jurisdictional REDD+ | National and state governments, not individual projects |
Two regional standards matter in Latin America: Cercarbono, which lists projects on EcoRegistry and is recognized in Colombian and Chilean compliance schemes, and
BioCarbon Standard, with ARR, REDD+, IFM and blue carbon methodologies.
Puro.earth and Rainbow certify durable removals such as biochar but have no reforestation methodology.
What each standard asks you to monitor
This is the part most comparisons skip, and the part that shapes your field operations for decades.
| Standard | Verifier checks at least | Field measurement | Satellite role | Commitment and buffer |
|---|---|---|---|---|
| Verra VCS, VM0047 | Every 5 years for most monitored parameters | Biomass plots (area-based) or a census of every planted tree (census-based) | Area-based crediting compares project plots with matched control plots | Pooled buffer sized by Verra's non-permanence risk tool |
| Gold Standard A/R | Every 5 years, with a VVB site visit at least every 3 years | Inventory plots at ±20% precision with 90% confidence, or the excess error is deducted | Set by the methodology | 30–50 year crediting; 20% buffer |
| Plan Vivo | Every 5 years | Set by the methodology (PM001, or PM002 for small-scale agroforestry) | PM002 uses remote sensing | 10–50 year crediting; 20% risk buffer |
| ACR | Every 5 years, with a site visit; A/R projects can defer the first up to 12 years | Set by the methodology | Set by the methodology | 40-year minimum term; pooled buffer |
| Climate Action Reserve, US Forest | Site visits on a fixed schedule; annual monitoring reports | Forest inventory | Set by the protocol | 100 years of monitoring after the last issuance |
| Isometric Reforestation | Reporting periods are normally 1–5 years; a longer period needs justification | Field plots at validation and first verification | The baseline is built from control pixels | Crediting period plus at least 40 years of monitoring |
Every one of these asks for the same underlying record: where the project is, what was planted or protected, what was measured, by whom and when. Methodologies differ in how they sample; none of them accept a reconstruction made the month before the audit.
What registration and issuance cost
Standards publish their own fees, and fees are only part of the cost. Validation and verification bodies (VVBs) charge separately.
| Standard | Before registration | Per credit issued | Fee schedule |
|---|---|---|---|
| Verra | $1,500 listing, $3,750 registration review, $750/year account; $5,000 per verification review, half credited toward issuance levies | $0.23 per tonne claimed at verification | |
| Gold Standard | $1,000 preliminary review, $2,500 design review, $1,000/year registry | $0.25 per credit | |
| Plan Vivo | $1,000 PIN review, $1,500–3,000 PDD review | $0.40 per credit up to 50,000 a year |  fees |
| ACR | $2,000 listing review, $5,000 validation review, $1,500/year account | $0.30 activation per credit | |
| Climate Action Reserve | $500 project submittal, $500 setup plus $500/year account | $0.20 per credit for projects submitted from 2026; $0.19 before |
Plan Vivo lets projects issuing 10,000 credits a year or fewer use independent experts instead of a VVB, which lowers the audit cost for small community projects.
Which methodologies carry the ICVCM label
The Integrity Council for the Voluntary Carbon Market (ICVCM) approves programs and methodologies separately. A credit carries its Core Carbon Principles (CCP) label only when both pass. All the standards above are approved programs. For nature methodologies, the assessment status page lists:
- Reforestation: Verra VM0047, ACR A/R of Degraded Lands, and Isometric Reforestation (version 1.1), Mangrove Restoration and Agroforestry are approved. Gold Standard's A/R methodology is still under review.
- Forest management: ACR's IFM methodology for non-federal US forestlands (versions 1.3, 2.0 and 2.1), Verra VM0045 v1.2 and the IFM part of the Climate Action Reserve Mexico Forest Protocol v3.0, for projects committing to at least 40 years, are approved.
- REDD+: ART TREES 2.0 emission reductions (not its high-forest, low-deforestation or removals crediting), Verra's jurisdictional framework and Verra VM0048 are approved.
- Blue carbon: only Isometric's mangrove protocol is approved; Verra VM0033 and the BioCarbon and Cercarbono coastal methodologies are still being assessed.
Where each standard fits
Verra VCS
Good fit: Most ARR, IFM and REDD+ projects outside North America. VM0047 is the reforestation methodology, with an area-based approach for new forest and a census-based approach for trees scattered on farms. The older CDM methodology AR-ACM0003 was inactivated in VCS in September 2023.
Plan for: Most VCS version 5 rules apply from January 1, 2027, with transition dates that vary by requirement. It asks for digital submission through the Verra Project Hub where a digital methodology exists, a geolocation file at registration, and stronger consent and benefit-sharing rules.
Sources: VCS v5 overview,
VM0047,
registry.
Gold Standard
Good fit: Afforestation and reforestation projects that want to show sustainable-development outcomes next to carbon. Gold Standard can issue forward credits (PERs) for up to five years of expected removals, which helps fund planting before trees grow. Annex B of its land-use rules simplifies requirements for smallholder projects.
Plan for: Its A/R methodology does not yet carry the ICVCM label, and it has no REDD+ methodology.
Sources: land-use requirements,
GHG product requirements,
registry.
Plan Vivo
Good fit: Smallholder and community projects where the people planting are the project. Over the crediting period, at least 60% of credit-sale income, after host-country charges, must benefit participants and other local stakeholders. Acorn's smallholder agroforestry program certifies under Plan Vivo's PM002 methodology.
Plan for: A smaller buyer market than Verra's. Compare it with the alternatives in Plan Vivo vs Gold Standard vs Verra for smallholder agroforestry.
Sources: methodologies.
ACR
Good fit: US and Canadian forest carbon, and reforestation of degraded land outside REDD+ countries.
Plan for: A 40-year minimum project term and a site-visit verification at least every five years, though reforestation projects can defer the first one up to 12 years.
Sources: methodologies,
ACR Standard v8.0.
Climate Action Reserve
Good fit: US forest projects under the US Forest Protocol, and Mexican ejidos and comunidades under the Mexico Forest Protocol, where the community assembly approves the permanence commitment.
Plan for: 100 years of monitoring in the US. The Mexico protocol issues credits in proportion to a 30–100 year commitment.
Sources: US Forest Protocol,
Mexico Forest Protocol.
Isometric
Good fit: Developers selling removals to buyers who want a dynamic, satellite-based baseline and a public registry with the project data.
Plan for: Monitoring for at least 40 years after the crediting period.
Sources: Reforestation protocol.
ART TREES
Good fit: Governments. ART credits national and state-level REDD+ programs. Communities, Indigenous Peoples and companies take part through the jurisdiction's program rather than registering their own project. TREES 3.0 was approved in June 2026.
Sources: TREES 3.0.
Where mapped projects sit today
A public dataset of 575 nature-based carbon projects in 55 countries, most with mapped boundaries and 42 as point locations (Karnik et al. 2024, CC BY 4.0), gives a rough picture of where projects register. By our count of that dataset, 294 are on Verra, 134 on the Climate Action Reserve, 96 on ACR, 33 on EcoRegistry, 17 on Gold Standard and 1 on BioCarbon. By type, 252 are IFM, 190 are ARR and 133 are avoided deforestation. It is a 2024 sample, not a complete list of any registry.
Before you choose a standard
- Read the methodology's monitoring section first. It tells you what your field team will do every year.
- Check the methodology's ICVCM status, not just the program's.
- Ask a VVB for a quote early. Their cost and availability can decide the timeline.
- Decide who owns the monitoring record. Plots, tree IDs, photos and planting dates have to stay consistent for as long as the project runs, often longer than any one staff member stays.
The WRI and Climate Focus Restoration Monitoring Tools Guide lists 17 carbon crediting methodologies with a short description and link for each (Reytar, Levin, Gladstone & Dyck 2023). It is a good starting list; this page adds the monitoring, cost and ICVCM details.
More guides: VM0047 field data for ARR projects, Plan Vivo vs Gold Standard vs Verra, restoration monitoring tools compared and field-data apps for reforestation teams.
Questions project developers ask
Which carbon standard is best for reforestation?
Verra lists the most nature-based projects, and its VM0047 methodology carries the ICVCM label. Gold Standard suits projects that lead with co-benefits, Plan Vivo suits community and smallholder projects, and ACR or the Climate Action Reserve suit North American forests.
Which standard is cheapest for a small project?
Plan Vivo lets projects issuing 10,000 credits a year or fewer use independent experts instead of a VVB, and Gold Standard allows approved individual auditors for some later smallholder certifications. Registry fees are only part of the cost; validators and verifiers charge separately.
How often do carbon projects need verification?
At least every five years under Verra VM0047, Gold Standard, Plan Vivo and ACR. Gold Standard also requires a VVB site visit at least every three years, and ACR lets reforestation projects defer the first verification up to 12 years. The Climate Action Reserve also requires annual monitoring reports.
Can one project use more than one standard?
Each credit is issued under one standard, since issuing the same removal twice would be double counting. A project can add labels such as Verra's CCB Standards for community and biodiversity benefits on top.
What is the difference between a standard and a registry?
A standard sets the rules; a registry records who owns and retires each credit. Verra, Gold Standard, ACR, the Climate Action Reserve and Isometric run both. EcoRegistry is a registry that hosts other standards, mainly Cercarbono.
Does monitoring software certify credits?
No. Standards and their verifiers do. Software keeps the record a verifier checks, so verification does not depend on rebuilding it from spreadsheets. See Restoration Scope for carbon projects.
