Carbon Standards for Nature Projects Compared, from Verra to Plan Vivo

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 17–18, 2026.

Compare the main standards

Compare the main standards

Standard	Run by	Nature project types	Best known for
⁠Verra VCS	Verra, US nonprofit	ARR, IFM, REDD+, wetlands, grasslands, agricultural land	The largest volume of nature credits; any country, any scale
⁠Gold Standard	Gold Standard Foundation, Switzerland	Afforestation/reforestation, agriculture, mangroves	Sustainable-development co-benefits alongside carbon
⁠Plan Vivo	Plan Vivo Foundation, UK charity	Smallholder and community forestry, agroforestry, forest protection	Community-led projects; most credit income goes to participants
⁠ACR	Winrock International	A/R of degraded lands, US and Canadian IFM, US pocosin wetlands	North American forestry; also serves compliance markets
⁠Climate Action Reserve	Climate Action Reserve, US nonprofit	US forests; Mexican community forests	100-year permanence in the US; ejido-led projects in Mexico
⁠Isometric	Isometric, UK/US	Reforestation, agroforestry, mangroves, IFM	Removal-only crediting with a satellite control baseline
⁠ART TREES	Winrock International	Jurisdictional REDD+	National and state governments, not individual projects
Equitable Earth	Equitable Earth, French mission-driven company (formerly ERS)	Forest restoration, REDD+	Credits calculated centrally from satellite biomass maps; every community benefit costed in the budget
BioCarbon Standard	BioCarbon Cert, Colombian company	ARR, IFM, REDD+, blue carbon	Latin American projects; methodologies that spell out the field records they expect
Cercarbono	Certificadora de Carbono, Colombian company	ARR, REDD+, blue carbon	Recognized in Colombian and Chilean compliance schemes; projects listed on EcoRegistry

⁠Puro.earth and Rainbow certify durable removals such as biochar but have no reforestation methodology.

For a closer look by project type, see the guides to reforestation (ARR), REDD+ and forest conservation, improved forest management and blue carbon.

What each standard asks you to monitor

This is the part most comparisons skip, and the part that shapes your field operations for decades.

What each standard asks you to monitor

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	Plots at ±10% precision with 90% confidence	Set by the methodology	40-year minimum term; pooled buffer
⁠Climate Action Reserve, US Forest	Annual monitoring reports; a site visit after every 6th, or every 12th for small projects	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 throughout crediting, measured at least every 5 years	The baseline is built from control pixels	Crediting period plus at least 40 years of monitoring; 20% buffer
Equitable Earth	Every 1–5 years, with annual reports	Restoration: optional LiDAR plots to calibrate the biomass maps (protocol paused since July 2026). Conservation: field assessments every 5 years	Equitable Earth calculates credits from satellite biomass maps	40-year crediting, renewable to 100; 20% buffer

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.

What registration and issuance cost

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	⁠fees, ⁠FAQ
⁠Gold Standard	$1,000 preliminary review, $2,500 design review, $1,000/year registry	$0.25 per credit	⁠fees
⁠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	⁠fees
⁠Climate Action Reserve	$500 project submittal, $500 setup plus $500/year account	$0.20 per credit for projects submitted from 2026; $0.19 before	⁠fees
⁠Isometric	None charged to the developer	None; buyers pay Isometric a per-tonne fee on delivery, set by pathway	⁠pricing
⁠ART TREES	No account fee for government, Indigenous Peoples and local community accounts	$0.25 per credit for issuances up to 5 million; issuances in 2026 still use the December 2021 schedule	⁠fees
Equitable Earth	€15,000 baseline; feasibility review €25,000 + €0.25/ha and design review €30,000 + €0.05/ha, each capped at €250,000	None; instead €15,000 + €1/ha a year for monitoring and reporting	⁠fees
BioCarbon	$300 account, $270 project inscription	$0.05 registration plus $0.14 issuance per credit, for up to 100,000 credits a verification; less above that	⁠fees
Cercarbono	$200 account, $3,000 project registration	$0.15 per credit (2025 schedule)	⁠fees

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:

CORSIA and host-country authorization

Airlines meet their offsetting duties under CORSIA, the scheme run by the UN aviation agency ICAO, with credits from programs ICAO approves for each compliance period. The first phase covers 2024–2026, and 2027–2029 opens the second. Program approval is only the start. For credits from 2021 onward, the host country has to authorize their use in a Letter of Authorization and apply a corresponding adjustment, so the same tonne doesn't also count toward its own Paris Agreement target. Until that adjustment shows up in the country's reporting, Verra and Gold Standard accept approved insurance instead, and ACR labels credits "CORSIA Pending" while the letter is missing.

CORSIA and host-country authorization

Standard	2024–2026	2027–2029	Nature credits ICAO leaves out
⁠Verra VCS	Approved	Approved	Land-use projects in REDD+ countries expected to issue more than 7,000 credits a year, unless they use a listed methodology (VM0033 is listed; VM0047 and VM0048 are not) or are nested in a jurisdictional program under Scenario 2a or 3
⁠Gold Standard	Approved	Approved	Forward credits (PERs); land-use and forestry projects in REDD+ countries expected to issue more than 7,000 credits a year
⁠ACR	Approved	Approved	Land-use projects in REDD+ countries expected to issue more than 7,000 credits a year
⁠Climate Action Reserve	Approved	Applied	Climate Forward credits; land-use projects in REDD+ countries expected to issue more than 7,000 credits a year, except under the Mexico Forest Protocol
⁠Isometric	Approved	Applied	All its nature protocols, reforestation included; only some biochar and direct air capture credits qualify
⁠ART TREES	Approved	Approved	None beyond the authorization rules
⁠Plan Vivo	Not approved	Applied	—
Cercarbono	Conditionally eligible	Applied	—
BioCarbon	Not approved	Applied	—
Equitable Earth	Not approved	Applied	—

ICAO's Technical Advisory Body finished assessing the 2027–2029 applications in September 2026, and the ICAO Council is due to consider them in November 2026. Cercarbono's first-phase eligibility waits on further actions by the program.

ICAO uses "REDD+ countries" for countries pursuing REDD+ under the UN climate convention's decisions, including the Warsaw Framework, and the 7,000-credit estimate is the one made at registration. In practice, a large VM0047 reforestation project in a REDD+ country can't get Verra's CORSIA label unless it is nested in a jurisdictional program. Smaller projects, and blue carbon under VM0033, can still qualify.

Where each standard fits

Only Gold Standard, Plan Vivo and the Climate Action Reserve offer forward credits, issued against expected removals; the others credit verified results only.

Verra VCS

Gold Standard

Plan Vivo

ACR

Climate Action Reserve

Isometric

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. ART released TREES 3.0 in June 2026; ICVCM hasn't assessed it yet.

Equitable Earth

BioCarbon Standard

Cercarbono

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.
• If you plan to sell to airlines, ask the host government early how it issues Letters of Authorization; without one, a credit can't be used under CORSIA.
• 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: carbon standards for reforestation, REDD+ and forest conservation, improved forest management and blue carbon, VM0047 field data for ARR projects, Plan Vivo vs Gold Standard vs Verra, restoration monitoring tools compared and field-data apps for reforestation teams.