People searching nbs standard usually mean one document: the IUCN Global Standard for Nature-based Solutions. First edition 2020. Second edition published 2026, after a 10 October 2025 launch at the World Conservation Congress in Abu Dhabi. Eight criteria. Twenty-seven indicators. A self-assessment that scores how well an action matches good practice.
That is a process for qualifying an action. It is not a funded acre.
A city can run the Self-Assessment Tool, land a strong match, cut a ribbon, and still have no one paying to keep the wetland working next year. The standard did its job. Payroll is a different job.
what the iucn global standard actually is
IUCN wrote the standard so the phrase nature-based solutions would not mean whatever a brochure needed it to mean. The Union's 2016 definition is an action: protect, sustainably manage, and restore natural or modified ecosystems to address societal challenges, with human well-being and biodiversity benefits together. What nature-based solutions actually are holds that sentence. This page holds the process that follows it.
The Global Standard is, in IUCN's own framing, a "user-friendly framework for assessing, implementing, and monitoring scalable, high-integrity NbS." It is process-oriented. It "purposefully avoids a rigid normative framing with fixed, definitive thresholds of what NbS ought to achieve." The job is design guidance, verification, and scaling — a common set of criteria so governments, cities, businesses, donors, and communities can tell a legitimate NbS from a green label.
The package is three pieces, not one:
| piece | what it does |
|---|---|
| eight criteria | the essential elements for an action to be environmentally appropriate, socially beneficial, and economically viable — equal status, no hierarchy |
| twenty-seven indicators | the means of assessing whether each criterion is fulfilled (one indicator applied as appropriate) |
| self-assessment tool (SAT) | a structured Q&A on iNbS that returns a percentage match and a traffic-light view of gaps |
That traffic light is quality assurance. A practitioner should hear it as a real instrument. It is how you keep the phrase honest. It is also not a treasury.
You might be thinking: if donors already require a SAT score before they fund, then the standard is how money moves. Screening is not paying. A donor can use the standard as a gate, write a grant, and still leave the living system without a second ticket after the grant closes. The gate told them the action qualified. The acre still needs a payor after the verb ends.
what the 2026 second edition actually changed
Treat the second edition as an illustration of what a standard is for — not as a product launch.
IUCN Council endorsed the updated criteria on 19 May 2025. The Union launched the Second Edition on 10 October 2025 in Abu Dhabi. The publication year on the document is 2026 (ISBN 978-2-8317-2392-1). Five years of use sat behind the rewrite. The first edition was 2020.
The skeleton held: eight criteria still, indicators 28 in 2020 and 27 in the second edition (including one applied as appropriate). What moved is the point of this illustration.
From checklist toward systems. IUCN says the revised standard "moves beyond a checklist approach to embrace systems thinking." Criterion 2 is the visible swap. The first edition asked that design be "informed by scale." The second asks that NbS incorporate an ecological, economic, social, and cultural systems perspective — interactions, synergies across sectors, and risk identification, not just the site boundary.
Financial feasibility, named more clearly. Criterion 4 is now "NbS are financially feasible and economically justified," not merely "economically viable." Indicator 4.3 is the sentence boards misread: "Financial mechanisms are identified and secured to ensure NbS long-term viability." Read it as a requirement on the project, not a mechanism supplied by IUCN. The standard asks you to show that a payor exists. It does not become that payor.
Enabling conditions, not a budget line. Criterion 8 now asks NbS to contribute to the enhancement of enabling conditions for implementation, sustainability, and mainstreaming — policy, finance, and regulatory frameworks. Contributing to a framework is still not writing the operating check.
Equity and safeguards, tightened. Indigenous Peoples and local communities are placed at the centre of decision-making. Safeguards, grievance mechanisms, and adaptive management are strengthened. That is integrity work. Integrity work is how you keep an action from harming the people who live with the living system. It is not how the canopy gets a payroll.
Charles Karangwa, IUCN's Global Head of the Nature-based Solutions Hub, put the investment language in the launch: the update "reinforces the link between ecological integrity and sustainable investment" and "strengthens financial feasibility." Hold that honestly. Stronger framing of feasibility is a better process. A better process is still a process.
A building code that requires a fire-suppression system does not spray water. Criterion 4.3 is the code. The hydrant is elsewhere.
a process is not a payor
Four layers get stacked under one heading. Only one of them is the nbs standard.
| what it is | success test | failure mode | |
|---|---|---|---|
| action (NbS) | protect, manage, or restore, aimed at a societal problem | the challenge is addressed without wrecking biodiversity | the verb ends; the living system was never the object |
| standard | eight criteria, indicators, SAT | the action qualifies as NbS | the score is treated as if the acre were funded |
| living system | wetland, canopy, reef | condition holds next season | the project closed and the marsh thins |
| payor | statute, rate, owner, grant, certificate | money arrives at care | a process document is counted as cash |
The wetland, canopy, and reef exist whether or not anyone labels a project NbS. The standard does not create them. Meeting it does not keep them.
This is the contrast: qualify versus pay. The SAT returns a match against good practice. A funded acre is a living system with someone responsible for its condition after the action's capital line closes. You can have a high match and an unfunded marsh. You can have a funded marsh that never sat for a SAT. They are different tickets.
ISO 17620:2025 is a process for designing and implementing biodiversity net gain on development projects — a cousin of the IUCN NbS standard, not a payor either; that thread lives in demand by statute.
The U.S. Army Corps of Engineers' NbS guidance and UNEP's ecosystem-service flow accounts sit in the same family. Absorb them. None of them is the acre's payroll. An nbs is not the asset is the object cut. NbS is not natural infrastructure is the dialect cut. Who pays after the NbS ribbon is the payroll cut. This post stays on the standard.
the second ticket is still the living condition
You might already be objecting that a serious NbS includes a finance plan because Criterion 4 requires one. Some projects do name a second ticket — a utility rate, a municipal line, a steward contract, an endowment — and then fund it. Those projects used the standard as designed: they showed the mechanism. The mechanism is still a separate object from the score.
The error is the substitution. The SAT file becomes "we have NbS." The launch becomes "the acre is handled." Boards hear "we met the Global Standard" as if the living system had been paid. A standard is not a funded acre. Useful process. Different ticket.
ensurance funds the living condition the project depends on — it is not the project name. That is a narrow claim. A certificate is a funded relationship with a named living condition, not another name for the NbS and not a substitute for IUCN's process. Use the standard to keep the action honest. Use a payor to keep the object alive. Confusing them is how a grant closes on "the NbS" while the marsh thins.
Our stage, stated plainly. The instruments are live. The volumes are small. Nothing about the definition of an nbs standard requires waiting for us. Cities, agencies, and foundations that already have a care line should keep it. The process remains a process whether or not our instrument carries the second ticket.
If you came here because you typed nbs standard, you have the distinction. The next useful reads are the definition underneath, and the statute-made-buyer question if your process is a law rather than a Union standard.
frequently asked questions
what is the iucn global standard for nbs?
The IUCN Global Standard for Nature-based Solutions is a process-oriented quality-assurance framework — eight criteria and twenty-seven indicators, with a self-assessment tool — for designing, verifying, and scaling nature-based solutions. It tells you whether an action qualifies as NbS. It does not fund the living system that action is about.
what does the 2026 second edition change?
The Second Edition, launched 10 October 2025 and published 2026, keeps eight criteria. It moves from a checklist toward systems thinking, restates Criterion 4 as financial feasibility with a requirement to identify and secure long-term financial mechanisms, tightens equity and safeguards, and asks projects to strengthen enabling conditions. Clearer feasibility is still not a payor.
does meeting the standard fund the project?
No. Meeting the standard means the action was designed and assessed against IUCN's criteria. Criterion 4 asks you to show that financial mechanisms exist; the assessment is not one of those mechanisms. A strong SAT score is a qualified action, not a funded acre.
how is iso 17620 different?
ISO 17620:2025 specifies a process for designing and implementing biodiversity net gain in development projects. It is a cousin of the IUCN NbS standard: another process, still not a buyer. The statute-made-buyer question is demand by statute.
taking action
You do not need a second self-assessment. You need to stop treating the first one as the transfer.
- Keep the standard. Use IUCN's process to qualify the action. Do not ask it to be a wallet.
- Read the definition — what nature-based solutions actually are.
- If your process is a statute — demand by statute is the payor question for that cousin.
Explore natural assets if you want the object the criteria were written about. Leave with the distinction even if you never buy an instrument.