UAO Fiduciary · Natural Capital
Voluntary nature reporting is about to become the basis for a global standard. The preparation window is now.
In November 2025, the International Sustainability Standards Board announced that it would move into a formal standard-setting process on nature-related risks, drawing on the recommendations, metrics and guidance of the TNFD. The Board is targeting an exposure draft of incremental disclosure requirements by October 2026. In plain terms: the voluntary framework is becoming the scaffolding for a mandatory one.
For owners, this changes the calculus. Voluntary disclosure rewards early movers and tolerates the laggards. A standard does neither. Once the ISSB anchors nature reporting in the same architecture that underpins its climate standard, the question shifts from whether to report to whether your data is good enough to withstand assurance.
The data problem is the real problem
Nature data is harder than carbon data. Emissions reduce to a single comparable unit; nature does not. Dependencies and impacts are local, ecosystem-specific and often buried deep in supply chains. The owners that struggle in 2027 will not be the ones that lacked intent — they will be the ones that lacked the data lineage to support a disclosure an auditor can sign.
Voluntary disclosure tolerates laggards. A standard does not. The preparation is data, and data takes time.
That is why the preparation window matters now, well before the exposure draft is final. Building the measurement capability — locating where in the portfolio nature dependencies actually sit — is a multi-year exercise that cannot be compressed into the quarter before a rule takes effect.
What prudent owners are doing
The leading funds are treating the ISSB signal as a deadline rather than a suggestion. They are mapping their most material nature dependencies, joining the preparer forums that are building shared methodology, and integrating nature into the same risk processes that already handle climate. The PRI and UNEP FI capacity-building initiatives exist precisely to compress that learning curve.
This section will track the standard as it forms and the owners as they prepare. The lesson from the climate-disclosure transition is unambiguous: the institutions that built the data early found the standard a formality, and the ones that waited found it a scramble.
The counter-case · the strongest opposing view
A standard is not an unmixed good. Critics argue that mandating nature disclosure before the data and methods are mature risks locking in poor metrics and imposing heavy costs for information of uncertain value. Comparable, audited nature data may be years away regardless of the standard, and premature assurance requirements could favour large incumbents able to absorb compliance costs. Supporters' “prepare now” urgency and skeptics' “measure twice” caution are both defensible — the timing trade-off is real, and reasonable funds are landing in different places on it.
UAO Fiduciary sets out the argument and the strongest counter-argument so allocators can weigh the evidence themselves. We report the debate; we do not pick a side.
Natural Capital — Nature and biodiversity as the next frontier of owner duty — TNFD, the coming ISSB nature standard, and ecological risk as a portfolio dependency. · Weekly. Part of UAO Fiduciary.
Researched and edited by the UAO editorial desk.