Search what is nbs and you will usually get a photograph of a wetland. That is the mix-up this page exists to stop.
NBS — nature-based solutions, also written NbS — names an action. You protect, manage, or restore a living system so a societal problem gets smaller: flood peaks, water scarcity, heat, food security, biodiversity loss. The wetland in the photograph is not the action. It is the living thing the action is about.
The wetland, canopy, and reef exist whether or not anyone labels a project NbS.
what nbs actually names
IUCN, which coined and standardized the term, defines nature-based solutions as actions to protect, sustainably manage, and restore natural or modified ecosystems, that address societal challenges effectively and adaptively, while providing human well-being and biodiversity benefits at the same time.
Read that as an engineer would. The subject of the sentence is actions. Protect. Sustainably manage. Restore. The object is a living or modified ecosystem. The purpose is a societal challenge — not a landscaping preference, and not a habitat photo on a grant cover.
The UN Environment Assembly later adopted a close cousin of that wording in resolution 5/5 (2022). That is why NBS is the one phrase in this family with a definition governments have actually agreed. The agreement matters for procurement. It does not turn a marsh into a project.
Three things sit in the same frame and keep getting collapsed:
| object | what it is | what it is not |
|---|---|---|
| nature-based solution | An action aimed at a societal problem, using a living or modified ecosystem | The wetland, forest, reef, or canopy itself |
| living system / natural asset | The named place, species, or process that already works — or used to | A grant, a standard score, or a construction contract |
| IUCN Global Standard | A process for designing and judging whether an action qualifies as NbS | A payor, a budget line, or a funded acre |
The standard is real. The eight criteria exist so a practitioner can tell a genuine NbS from a greenwashed earthwork. That is useful work. It is not this post. The standard as a process — and why a process is not a funded acre — is the next piece in this series. Here the only job is the object mix-up: people point at the marsh and call it the NBS.
wetland as flood nbs vs wetland as living asset
Take a floodplain marsh on the edge of a city. Saturated soil, plants that only grow wet, a channel that still remembers how to spread.
A public-works team reconnects 40 acres of that floodplain, removes a berm, replants the wet meadow, and sizes the work against a 25-year peak. On the grant, the project is an NBS for flooding. That is a fair label. The action is restoration, aimed at a societal problem, using a living system. IUCN would recognize the shape.
Now look at the same 40 acres without the grant language.
The marsh was already doing flood work, water-quality work, habitat work, and a dozen other jobs jointly, whether or not anyone wrote "NbS" on a slide. Drain it and the peak does not vanish; it moves. Restore it and you have not created a wetland out of a logo. You have changed the condition of a living asset that was already a wetland — degraded, disconnected, or intact.
| wetland as flood nbs | wetland as the living asset | |
|---|---|---|
| what it is | An action: restore, reconnect, or manage the marsh so a flood peak drops | The marsh itself — hydric soil, water, plants, and animals in a named place |
| when it starts | When the project is scoped against a societal problem | Before the RFP. After the ribbon. Whether or not a project exists |
| what success looks like | The problem shrinks: lower peak, fewer claims, a number a council can hear | The living condition holds: hydrology, vegetation, the work the acre actually does |
| what you can close | A construction contract, a grant, an IUCN self-assessment | Nothing. It keeps working or it does not |
| what still needs a payor | The living condition after year three | The same thing, with or without the NBS label |
An engineer should hear this as a scope distinction, not a metaphor. You can deliver the NBS — the reconnection, the planting, the model that shows a shaved peak — and still miss the asset. The asset is the marsh that has to stay wet. If the hydrology fails in year four, you did not keep a solution. You kept a memory of one.
A conservationist should hear the inverse: the wetland is not a project. Calling it an NBS does not make it one. Projects end. Wetlands do not, unless you let them.
The living wetland, as a thing, is already written: what wetlands actually are. A city that already bought living stormwater as infrastructure is Durban. This post will not retell either. It only needs the split: the flood NBS is the action; the wetland is the asset.
the same trap in a forest
No. A forest is a living system. Same trap, different photograph.
Thinning a stand so a fire behaves, restoring a riparian corridor so a drought year still yields water, protecting a catchment forest so a city does not filter silt it used to get for free — those are nature-based solutions. They are actions, aimed at problems, using a living system.
The forest was already the forest. It did not become an NBS when someone put it in a resilience plan. It does not stop being a forest when the plan is printed. If you need the living object in its own words, that is what forests actually are.
The same sentence works for a reef, a dune, a grassland, a restored channel. The NBS is the protection, the management, or the restoration. The asset is the living thing those verbs are pointed at.
the label is not the invoice
Cities, agencies, and infrastructure investors already have several names for overlapping parts of the same living system: green infrastructure, natural infrastructure, nature-based infrastructure, living infrastructure. Those are procurement dialects. They are not this post. The glossary — who uses which phrase, and why the invoice still never arrives — lives in four names, one unpaid system. Use it when you need the budget code. Do not treat those four names as four different wetlands.
NBS sits next to that map as the action label. Natural infrastructure, in U.S. Army Corps of Engineers usage, is closer to the object: the wetland, dune, or floodplain already doing work. Mixing "we did an NBS" with "we now have natural infrastructure" is how a ribbon gets cut for an action and the object still has no operating budget.
A natural asset is the living thing. The instrument that funds its condition is not the thing. That distinction, without the NBS overlay, is what a natural asset actually is.
what an engineer and an allocator should actually hold
If you run a city, a flood authority, or a resilience desk, the useful question is not "do we have an NBS?" It is "what living system is the action about, and who pays for its condition after the action closes?"
If you allocate infrastructure capital, the useful question is not "is this IUCN-aligned?" Alignment is a quality screen for the action. It is not a cashflow for the acre. Meeting a standard means the intervention was designed to qualify. It does not mean the marsh has a payor in year five. The standard as a process is the next post. Do not skip it, and do not ask it to do a treasurer's job.
The distinction is not academic. If the project restores the wetland, the action and the asset still are not the same object. The project can close on time, on budget, and on standard, and the living condition can still be unfunded. That is not a failure of IUCN. It is a failure to notice there were two objects in the photograph.
Ensurance is how the living condition gets a second ticket: a way to fund the marsh, the canopy, or the reef as a named natural asset, not as a project name. The protocol is live. Volumes are small. It is not a substitute for the restoration contract, and it is not the NBS. Certificates here are claims tied to a named living system, not a new word for the grant. If you want the category definition first, start with what nature-based solutions actually are.
questions people type
what is nbs?
NBS is short for nature-based solutions (also NbS). It means actions to protect, sustainably manage, or restore natural or modified ecosystems so a societal challenge gets smaller, while people and biodiversity both benefit. IUCN's definition is the one practitioners use; UNEA resolution 5/5 is the wording governments agreed. The living system is not the NBS. The action is.
is a wetland an nbs?
No. A wetland is a living system — a natural asset. Restoring, reconnecting, or managing that wetland so a flood peak drops, a city drinks cleaner water, or habitat returns is an NBS. The marsh in the photograph is the thing the action is about. It is not the action.
is a forest an nbs?
No. A forest is a living system. Protecting, managing, or restoring it to shrink a societal problem — fire behavior, water yield, heat, biodiversity — is the NBS. The stand does not become a project because it entered a resilience plan.
what is the difference between an nbs and a natural asset?
An NBS is an action aimed at a societal problem, using a living or modified ecosystem. A natural asset is the living thing itself: a named wetland, forest, reef, species, or process. You can complete the NBS and still leave the asset unfunded. The action can close. The living condition cannot.
what to read next
You typed what is nbs. The honest one-line answer is: an action, not an acre.
If you need the category in full — IUCN in their words, then action versus living system versus standard — read what nature-based solutions actually are.
If you need the living object without the project overlay, read what a natural asset actually is.
If you are stuck in procurement language, use four names, one unpaid system and then come back. The dialect is not the asset either.
Named living systems already on the protocol: natural assets.