What separates one funding mechanism from another is not the amount of money involved. It is three structural facts, and they decide which mechanism can be made to fit a given problem.
The first is who pays. A payment for ecosystem services is funded by a fuel tax, a water tariff or a downstream buyer. A debt conversion is funded by the discount at which a government can buy back its own bonds. An offset is funded by a developer who has been required to buy one. The second is who receives, and the range is wide: a landowner holding a five year contract, a national park service, or an independent fund with its own board and its own auditors. The third, and the one most often skipped in summaries, is what binds the two together. A contract that pays annually against a verified condition binds tightly, because the money stops. A bond covenant promising that proceeds will go to eligible categories binds loosely. A political commitment binds only as long as the administration that made it.
These mechanisms are rarely used alone. Debt conversions build trust funds, trust funds pay for ecosystem services, and subsidy reform frees the budget line that pays for all three. Each article below is written from the primary documents, the statutes, deal papers, fund reports and published evaluations, and names every source it uses.
The six mechanisms
- Payments for Ecosystem Services A price list for standing forest, and what thirty years of Costa Rican contracting shows about who enrols.
- Biodiversity Offsets and Credits Compensation a developer is required to buy, and the question of whether the gain was ever delivered.
- Green Bonds Debt raised against a promise about how the proceeds will be spent, and where nature sits in that market.
- Debt-for-Nature Swaps A sovereign refinancing whose savings are contractually committed to conservation. Seychelles, Belize, Ecuador, El Salvador.
- Conservation Trust Funds Capital held outside the budget cycle, and the governance that decides whether it lasts.
- Harmful Subsidy Reform The far larger budget line pointing the other way, and what moving it looks like in practice.