Somebody already pays for ecosystem services. Watershed payments alone moved $24.7 billion across 62 countries in 2015, up from $6.7 billion six years earlier. More than 550 programs are running worldwide, worth an estimated $36–42 billion a year. New York City started paying Catskills landowners for clean water in the early 1990s and skipped a filtration plant it would otherwise have had to build.
So payment for ecosystem services is not a proposal. It is a functioning global instrument, and the people who built it were right about the hard part: nature does work, that work has beneficiaries, and beneficiaries can be asked to pay.
What deserves a second look is the object of the payment.
the definition, without the euphemism
Payment for ecosystem services (PES) is a voluntary, conditional transaction in which someone who benefits from a natural process pays whoever manages the land to keep that process going. A water utility pays upstream ranchers. A hydropower operator pays for reduced sedimentation. A city pays for infiltration it would otherwise have to build in concrete.
The definition most programs still work from is Sven Wunder's, set out for CIFOR in 2005 and revisited by him in 2015. It has five moving parts:
| part | what it means |
|---|---|
| voluntary | nobody is compelled — this is a deal, not a fine |
| a defined service | the thing being bought is named: clean water, flood attenuation, pollination, habitat |
| a buyer | at least one beneficiary with a budget |
| a provider | at least one party with control over the land |
| conditionality | the payment depends on the provider doing the agreed thing |
Conditionality is what separates PES from a grant, and it is where the design gets interesting. In practice, very few contracts can condition on the service itself. They condition on a practice believed to produce it: fence the riparian corridor, retire the ditch, don't log the slope, plant this many stems, keep the forest standing for ten years.
That is a defensible proxy. It is not the same thing as the service. And neither the practice nor the service is the same thing as the living system underneath both.
the fen that was there first
Roughly nine miles south of Fairplay, Colorado, at just under 10,000 feet, there is a wetland called High Creek Fen.
It is an extreme rich fen — groundwater-fed, alkaline, running on calcium and magnesium leached out of glacial sediment. Only two or three others of that classification are known in the entire United States. It holds more rare plant species than any other wetland known in Colorado, several of them isolated populations that stayed put when the glaciers left.
It is also, in the most literal sense, slow. Peat in South Park's extreme rich fens accumulates at rates as low as four inches per thousand years. Close to a fifth of the extreme rich fen area in South Park has already been mined out and sold as soil amendment. That ground does not come back on any schedule a human institution recognizes. There is no vendor for four inches per thousand years.
Here is the part that matters for finance. The Nature Conservancy began protecting High Creek Fen in 1991 by buying it. Within a decade, research made clear that owning the polygon was not enough — the fen runs on groundwater arriving from somewhere else, so the water and the surrounding watershed had to be protected too. The work expanded outward toward 15,000 acres.
That is not a criticism of TNC. It is the opposite. Conservationists learned the flow-versus-factory lesson first, on the ground, with land title and hydrology reports. Where a program exists, dependents downstream can pay in — New York did, and water funds like Quito's FONAG are built for exactly that. What is rare is a way to fund the condition of a place like this one, in a basin with no program, without buying the ranch.
The fen exists whether or not anyone buys a certificate. Ensurance is how a dependent funds its condition. It is not what the fen is.
flow versus factory
The flows from that fen are what leave it: late-season water in High Creek, filtration, a refuge for rare plants, carbon held in saturated peat.
The factory is peat depth, groundwater head, water chemistry, and hydrologic connection to recharge ground that nobody has mapped for you.
A PES contract buys a flow, or a practice believed to make the flow. An offset credit buys one unit of one flow, sometimes in a different watershed entirely. Insurance buys you money after the flow fails. None of the three has a line item for peat depth.
| instrument | what the money is for | when it moves | what it assumes |
|---|---|---|---|
| PES contract | a named service, or the practice believed to produce it | on verified compliance with the agreed practice | that the buyer picked the right practice |
| offset credit | one unit of one service, often produced somewhere else | on verification against a baseline | that a counterfactual is knowable |
| insurance | your loss | after the damage | that damage is probable enough to price, and provable after |
| ensurance | the present condition of a named living system | now, while the system is still working | that funding a steward changes the condition, and that condition can be observed — no counterfactual required |
That last row has a name: ex nunc, "from now." It funds what is presently producing rather than pricing what might have happened or reimbursing what already did. Structurally it means the object of the payment is a place and its condition, held by an onchain account — an agent — with a certificate as the record of who funded it: one certificate series per agent, held by whoever funds it. That is plumbing. The fen is the point.
Two legs of Wunder's definition deserve a direct answer, because they are the ones procurement asks about. Who receives the money? Proceeds route to whoever actually stewards the place — the landowner, the land trust holding the easement, the contractor rewetting the ditch — through that place's own agent account. How is condition known? By valuing the place's ecological stocks and the flows they produce, and watching that over time, rather than auditing a practice checklist. The accounting exists to make the payment legible. It is not the thing being sold.
Now the honest part: a certificate is not a conditional contract. There is no clawback if the steward underperforms, and clawback is the one thing PES conditionality genuinely buys. What a certificate offers instead is a durable public record of who funded what, on which named place — legible to your board, your auditor, and the next payor who turns up in that basin. If that sounds like a grant with a wallet, the difference is where it lands: a grant dissolves into a general fund, while a certificate stays attached to one place whose condition anyone can go and check. Whether that trade is worth making depends on whether you are buying compliance or buying the continued existence of the factory.
who is actually paying, and who isn't
The largest PES programs in the world are not corporate. They are government subsidy and compliance schemes.
Costa Rica's Pago por Servicios Ambientales, established by Forest Law 7575 in 1996 and run by FONAFIFO, is the canonical example — and its funding tells the story. It recognizes four services of forests (carbon fixation, hydrological services, biodiversity, scenic beauty) and pays landowners for them. Most of the money is a fuel tax — roughly 3.5% of it, paid by anyone buying gasoline. The beneficiary money exists but is the minority slice: a quarter of the national water-use fee, paid by the concessionaires who actually draw the water, plus voluntary agreements with hydropower operators and bottlers in specific watersheds. It works. But the price signal from the parties who depend on those forests is the smaller half of the story, not the engine.
The global picture is the same shape. Watershed payments dominate because water utilities and fuel taxes were already collecting money from somebody — the researchers who compiled the global numbers credit existing collection institutions for much of that sector's growth. Forest and land-use carbon has topped $2.8 billion cumulatively since 2009. Biodiversity is the least developed in geographic scope and the least transparent of the three — global transactions are estimated somewhere between $2.5 and $8.4 billion a year, and the width of that range is the finding.
That is the tell. PES clusters where a collection mechanism already existed, not where the ecological dependency is sharpest. For a company, a county, or a water utility reading this, the practical consequence is uncomfortable: in most basins, there is no program for you to join. If your operations depend on a specific meadow, aquifer, canopy, or forage year, the odds that a public program already covers that place, at a scale that matters to it, and will accept your money, are low.
And when a voluntary market does form, concentration is the failure mode. One company accounted for 96% of nature-based carbon removal purchases in 2025; when it paused new commitments, the pipeline froze. That was not a market correcting — it was a patronage system revealing itself.
the objections worth having
"This is carbon credits with extra steps." Fair, and the difference is testable. A credit needs a baseline — what would have happened otherwise. Ensurance issues no unit of avoided anything and makes no offset claim. It funds the current condition of a specific place. If the place degrades, there is no counterfactual to litigate; the condition is simply worse. (The full credit critique lives in who buys a water credit.)
"PES already exists. Why does this need to be new?" It doesn't, and this isn't a replacement. PES is the older discipline and the right instinct; ensurance absorbs the logic rather than competing with it. The gap it addresses is narrower: the payor with a real dependency, a budget, and no program in their basin; the capital provider with blended or concessionary money and nothing to buy that isn't a credit; and the place with no program at all.
"So a certificate is the watershed?" No. A certificate funds a named agent. It is a record of funding, not a deed to a river and not an insurance policy. Confusing the instrument with the ecosystem is the failure mode we are trying to avoid, not one to commit on purpose.
"What can you actually buy today?" Live agents, live instruments, small volumes. The honest first step is a conversation about one named place and one payable you already carry. What we can put against it is a valuation, a certificate on a named agent, or a scoped engagement. Not a software seat, not a promised yield, and not a case study we can wave around to make the decision easy for you.
the line item you already carry
Households in fire and flood country pay before the disaster and again after; we asked what that is worth to them. Institutions do the same thing at a different scale and file it under operations.
| the bill you already pay | the living system behind it |
|---|---|
| trucked or purchased water in a dry year | headwater storage — snowpack, wet meadows, peat, shallow aquifers |
| higher treatment chemistry, earlier filtration capex | upstream infiltration and sediment control |
| lost production during curtailment | basin yield and its timing |
| crop, forage, or herd loss | soil moisture and the forage year |
| non-renewal, higher deductibles, more retained risk | fuel load, floodplain function, hydrologic buffering |
| rerouted freight and interrupted supply | the landscape your input actually grows on |
Every row in the left column is a bill for an ecosystem service — paid after it stopped, to whoever sells the substitute. It is the mirror image of PES, not an instance of it.
The move is not a new sustainability workstream. It is pointing one of those existing line items at the living system that shrinks the next one.
where this goes next
If the definition is what you came for, you have it: PES is a conditional payment for a named natural flow. It is real, it is large, it is mostly public money buying practices, and it rarely reaches the specific place your operations depend on.
If you came because something in your business is exposed to a living system you have never funded, the rest of this series is the path — the basin your operations actually drink from, the water bill you can prepay, the SKU with a place behind it, and what the first check buys.
what ensurance is, in the manual → · see the protocol →
frequently asked questions
what is payment for ecosystem services?
Payment for ecosystem services is a voluntary, conditional transaction in which a beneficiary of a natural process — clean water, flood attenuation, pollination, habitat — pays whoever manages the land to keep producing it. Most contracts condition payment on an agreed management practice rather than on the measured service.
how is payment for ecosystem services different from ensurance?
PES buys a service, or a practice believed to produce it, usually under a contract with a landholder. Ensurance funds the present condition of the living system that makes the service, on a named place, through an agent that can hold capital and route proceeds. PES pays for the flow. Ensurance funds the factory that makes the flow.
who typically pays for ecosystem services?
Governments, mostly. The largest programs worldwide are government-financed subsidy or compliance schemes — Costa Rica funds its national program mostly from a fuel tax, with a quarter of the water-use fee and private watershed agreements making up the beneficiary-paid minority. User-financed deals, where the actual beneficiary pays, are the smaller share everywhere: water utilities, beverage companies, hydropower operators, municipalities. Watershed payments are the largest sector by far; biodiversity is the least developed and least transparent.
the series
pay the source — six posts on how a dependent that already pays when a living system fails writes the first check to the living system itself.
- what payment for ecosystem services actually is — you are here
- corporate water stewardship is not a restored basin
- water risk is a bill you can prepay
- when the supply chain stops, look upstream
- how to start paying for the nature you depend on
- what the first check actually buys