When a central banker opens a biodiversity summit, nature has become a balance-sheet risk

Victoria Shinder26 October 2026, 10:302 min read

Frank Elderson opened the Finance and Biodiversity Day at COP17 with a line that sounds like environmental advocacy and is really prudential supervision: four years after the Kunming-Montreal Global Biodiversity Framework set a path to living in harmony with nature by 2050, progress has been limited, nature has kept deteriorating, and finance has a central role because, as he put it, without investment there is no transition. He is an executive board member of the ECB and vice-chair of its supervisory board. When that person tells a room that nature is an economic matter, the correct reading is not that a central bank has discovered the environment — it is that the central bank has concluded nature loss shows up on bank balance sheets.

The logic is less exotic than it sounds. Banks lend to firms, and firms depend on nature in ways that are invisible until they fail: water for manufacturing and cooling, pollination for agriculture, stable coastlines for ports and property, soil for the supply chains behind ordinary loans. A borrower whose operations quietly rely on an ecosystem service carries a risk the lender has not priced, and when that service degrades — an aquifer drawn down, a fishery collapsed, a flood plain built out — the loss lands on the loan. This is the same move supervisors made with climate a decade ago: reframe an environmental externality as a credit, market and operational risk that a prudent bank must identify and hold capital against. Nature is the next externality being pulled inside the fence.

The reason this matters for how the ECB behaves, rather than how it talks, is that a prudential framing has teeth a moral one does not. If nature-related risk is a financial risk, it belongs in the supervisory toolkit — in the expectations the ECB sets for how banks assess and disclose it, and eventually in how those risks feed capital. Elderson's "without investment there can be no transition" is also a statement about where he thinks the money has to come from, and a supervisor who believes a transition is necessary and underfunded has levers a speaker at a summit does not. The open question is calibration, not direction: nature risk is harder to measure than climate risk, with no single metric like carbon to anchor it, and a framework that cannot measure its target tends either to do nothing or to demand disclosure for its own sake. The honest read of the speech is that the ECB has decided nature is a prudential problem and has not yet decided how to price it — which is exactly the stage climate supervision was at not long ago, and a guide to what comes next.