The Bhutan Trust Fund for Environmental Conservation was set up in 1991 with a target endowment of twenty million dollars. Its own account puts the endowment at 84 million dollars as of September 2024, with more than 286 projects awarded since inception worth over 35 million dollars, and an annual grants budget of around two million. More than three decades of grant-making from a fund originally meant to be a quarter that size is the argument for the form, and also the reason the form is harder to build than it looks.
A conservation trust fund is a legally separate, usually non-governmental institution that holds capital and makes grants for conservation, independently of any one government's budget cycle or any one donor's project cycle. Bhutan's was a joint venture between the Royal Government of Bhutan, the United Nations Development Programme and WWF, and drew capital from WWF, the Global Environment Facility and the governments of Bhutan, Denmark, Finland, the Netherlands, Norway and Switzerland. It received a Royal Charter in 1996 which was revised in 2021.
Three shapes of capital
The distinction that matters most is between kinds of money, not kinds of institution. The Conservation Finance Alliance's glossary defines an endowment as a sum intended to exist in perpetuity or to preserve its capital over a long horizon, invested for the long term, with normally only the investment income spent. A sinking fund is the opposite instruction: a pool that will spend down its capital within a designated period, five, ten or twenty years, until principal and investment income are both disbursed and the fund sinks to zero. Revolving funds are named as a third arrangement in the same passage, though the glossary does not define them.
Real funds are usually more than one of these at once. The Alliance notes that many funds begin by managing a single programme account, an endowment or a sinking fund created to support one protected area or a network of them, and that as funds mature they tend to manage multiple programme accounts combining endowments, sinking funds and revolving funds. The choice is not ideological. An endowment buys permanence at the cost of spending power, since only the income is available. A sinking fund buys spending power at the cost of an end date.
How big the sector actually is
The numbers are smaller than the attention. Writing in the prologue to the 2020 Practice Standards, Lorenzo Rosenzweig Pasquel described a constituency of more than a hundred funds managing close to two billion dollars in endowment and project funds. The standards themselves put it more precisely: a 2020 global survey estimated that the world's conservation trust funds hold and manage over 1.9 billion dollars in endowments and sinking funds, and that among participating funds the investable assets of an individual fund ranged from 300,000 dollars up to 190 million.
For comparison, a single one of the recent sovereign debt conversions now routinely commits more conservation money than the largest fund in that range holds. The sector's problem has never been that endowments are a bad idea. It is that capitalising one at a useful size requires a donation nobody wanted to make. A fund with a four per cent spending policy needs twenty five dollars of capital for every dollar it distributes each year. Bhutan's two million dollar annual grants budget against an eighty four million dollar endowment is a distribution rate under two and a half per cent, which is what preserving the real value of capital actually looks like in practice.
Returns are not a plan
The Conservation Trust Investment Survey is the sector's own annual measurement of what those portfolios earn, and the most recent edition published on the Alliance's survey page is the 2018 report. That is worth stating plainly: sector-wide performance data newer than 2018 is not public from this source, and anyone who needs current figures should read the audited financial statements that individual funds publish rather than accept a sector average that has not been updated.
What the 2018 survey does show is instructive. Thirty four funds took part, of which 27 supplied returns and financial data. Together they managed over 723 million dollars of investable assets, an average of 27.8 million dollars each, across 45 individual funds: 31 endowments, 12 sinking funds and two reported as combined. Individual funds ranged from just over one million dollars to over 97 million. The participants had been operating between 3 and 26 years, averaging fourteen.
In 2018 the median nominal organisational return was minus 3.44 per cent and the mean was minus 2.71 per cent. Most organisational returns that year were negative. The survey's own explanation is that the mean and median still beat several external benchmarks because conservation trust fund portfolios skew on average toward fixed income, which buffers a down market and fails to capture the upside of a rising one. That is the trade a fiduciary board makes deliberately. It is also why a fund whose grant programme depends on a good year is not a fund at all, and why the standards press so hard on reserve funds and spending policies calculated on a rolling three or five year average to smooth the highs and lows.
What governance means in this context
The Practice Standards for Conservation Trust Funds, published in 2014 by Barry Spergel and Kathleen Mikitin and updated in 2020 by Paquita Bath, Viviana Lujan Gallegos and Amilcar Guzman Valladares, organise the field into seven core areas: governance, institutional effectiveness, programs, administration, asset management, resource mobilization, and risk management and safeguards. The last of these is the newest, added in 2020, and the 2020 edition also split the older operations area in two.
The governance standards are the ones that separate a durable fund from a bank account with a logo. Governing documents must define what the assets may be used for, and define the composition and powers of the governing body so that its members have a high level of independence and stakeholder representation. Members are selected on competence and commitment. The body meets at least three times a year and keeps accurate written records of every meeting and decision. It runs conflict of interest policies to reduce exposure to favouritism and reputational risk. It recruits and oversees a full-time chief executive. It keeps a compliance list covering applicable law, its own governing documents and every agreement with a donor. And the tenth standard is jurisdictional: a fund should be established under the laws of a country that effectively ensures its independence from government, enforces clear law on private non-governmental organisations, and does not subject the fund to substantial taxation.
The standards are explicit that they are written for independent non-governmental institutions, and describe such funds as public-private partnerships with governing bodies typically composed of a majority of civil society and private sector representatives, often including public representatives. The asset management standards add a specific requirement that is easy to skip and expensive to skip: the governing body must include at least one member who is a qualified professional in finance, business or economics, and must give every member targeted training in the concepts needed to make investment decisions.
The debt conversions are now the sector's growth engine
Four conservation trust funds created since 2015 exist because of a sovereign debt transaction, and their founding terms show the standards being applied in real time. Seychelles created SeyCCAT by statute in 2015; the SeyCCAT Act put government representatives in a minority on the board and capped administrative costs at 15 per cent of the money available each year, a ceiling raised to 30 per cent in the revised Act of 2022. The government and TNC agreed the fund should be protected against any future administration diverting its money to the consolidated fund, which also let applicants reach the money without going through the government at all.
Belize's Conservation Fund was capitalised with a 23.45 million dollar endowment prefunded out of the loan itself, is projected to compound at an assumed 7 per cent annually, and was designed with a board of nine directors drawn from government and from academia, fisheries, tourism and non-governmental organisations, with a permanent majority outside government. The Galapagos Life Fund is governed by eleven directors, five of them Ecuadorian ministers and six from outside government, and receives roughly 5.41 million dollars a year on average toward an endowment projected to pass 227 million dollars by 2041. Ecuador's Amazon Biocorridor Fund, announced in December 2024, states in its founding release that it will follow international standards for conservation trust funds, with a local board including Indigenous and community representatives, clear grantee selection procedures, annual public reports and independent audits.
El Salvador's case closes the loop. The fund co-managing the Rio Lempa programme, FIAES, was established in 1993 as a conservation trust fund, created out of a United States debt-for-nature swap with El Salvador, and has invested more than 90 million dollars in coastal, marine and terrestrial conservation across 31 years. It now administers a programme funded by a second, far larger swap, whose 150 million dollar endowment component is intended to keep paying out after the direct payments end in 2044.
Permanence in this field is not a financial property. A fund does not become durable by holding an endowment; Bhutan's grew from a twenty million dollar target to 84 million because a board met, kept minutes, hired professionals, published accounts and did not spend its capital for three decades. The instruments being written into today's debt conversions assume that same discipline will hold in institutions that are two years old, in countries that have just left default. Whether it does is a question the 2040s will answer, and the funds have already committed to publishing the evidence either way.
Sources
Every figure, date and deal name above is drawn from one of the documents below. Each was fetched and cached on the retrieval date shown.
- Conservation Finance Alliance, Practice Standards for Conservation Trust Funds, 2020 edition, by Paquita Bath, Viviana Lujan Gallegos and Amilcar Guzman Valladares, updating the 2014 edition by Barry Spergel and Kathleen Mikitin. Seven core areas, the tables of standards, and the glossary definitions of endowment and sinking fund https://www.conservationfinancealliance.org/s/Practice-Standards-For-Conservation-Trust-Funds-2020-EN-links-211208.pdf Retrieved 2026-08-30
- Conservation Finance Alliance, Conservation Trust Investment Survey 2018. The most recent edition published on the CFA’s CTIS page: participant demographics, aggregate investable assets and 2015 to 2018 nominal returns https://www.conservationfinancealliance.org/s/CTIS-2018-report-FINAL.pdf Retrieved 2026-08-30
- Conservation Finance Alliance, Conservation Trust Investment Survey index page, listing every published edition https://www.conservationfinancealliance.org/ctis Retrieved 2026-08-30
- Bhutan Trust Fund for Environmental Conservation, Organization. The fund’s own account of its 1991 founding, its endowment target and size, its Royal Charter, and its grant record https://bhutantrustfund.bt/organization/ Retrieved 2026-08-30
- SeyCCAT, The Seychelles Debt-for-nature Swap: A Case Study, March 2024. The SeyCCAT Act 2015 provisions on board composition and operating costs, the 2022 revision, and the grant record since 2018 https://seyccat.org/wp-content/uploads/2025/03/SeychellesDebtSwapCaseStudy_webversion.pdf Retrieved 2026-08-30
- The Nature Conservancy, Case Study: Belize Blue Bonds for Ocean Conservation. The Conservation Fund’s prefunded endowment, its projected market return assumption and its board composition https://www.nature.org/content/dam/tnc/nature/en/documents/TNC-Belize-Debt-Conversion-Case-Study.pdf Retrieved 2026-08-30
- U.S. International Development Finance Corporation, El Salvador release, 16 October 2024. The Rio Lempa endowment split, the programme board composition, and FIAES’s founding in 1993 out of a debt-for-nature swap https://www.dfc.gov/media/press-releases/worlds-largest-debt-conversion-conservation-river-and-its-watershed-completed Retrieved 2026-08-30
- U.S. International Development Finance Corporation, Galapagos release, 9 May 2023. The Galapagos Life Fund’s endowment schedule and its 11-member board https://www.dfc.gov/media/press-releases/financial-close-reached-largest-debt-conversion-marine-conservation-protect Retrieved 2026-08-30
- The Nature Conservancy, Ecuador Amazon release, 15 December 2024, stating that the Amazon Biocorridor Fund will follow international standards for conservation trust funds, with annual public reporting and independent audits https://www.nature.org/en-us/newsroom/ecuador-announces-debt-conversion-for-amazon-conservation-tnc-nature-bonds/ Retrieved 2026-08-30