In January this year, the UK government published a national security assessment on biodiversity loss. Prepared with the help of the Joint Intelligence Committee, the body that oversees MI5 and MI6, it was initially deemed too alarming to release and only emerged after a freedom of information request. Its central finding was blunt: “Every critical ecosystem is on a pathway to collapse.” When an intelligence assessment reads like a margin call, the language of portfolio theory stops being metaphor.

[https://www.gov.uk/government/publications/nature-security-assessment-on-global-biodiversity-loss-ecosystem-collapse-and-national-security]

Harry Markowitz won his Nobel Prize for a deceptively simple insight: it is the correlation between assets, not their individual performance, that determines whether a portfolio survives a shock. If everything you hold moves in the same direction when the crisis arrives, diversification is an illusion. Nature, it turns out, already understood this. A rainforest does not rely on a single species to sequester carbon or cycle nutrients. It spreads its investment across thousands of species whose performance varies across conditions. The jaguar, the fungi, the hummingbird, and the bromeliad do not peak and collapse together. Their asynchrony is what makes the system resilient.

Humanity has spent the past century doing the opposite. We replaced polycultures with monocultures, forests with oil palms, and thousands of local seed varieties with a handful of globally standardised hybrids. The returns looked impressive:........

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