By 2030 — closer in time than the last British general election was — the United Kingdom could begin to face serious shortages of food. That warning does not come from a climate advocacy group or an academic journal. It comes from the country's own spy chiefs, in a classified assessment that the Starmer government chose not to publish when it first became available, nearly a year ago. The report, originally commissioned under the previous Conservative administration, examines what would happen if key ecosystems around the world ceased to function as they do today.

Two regions receive particular attention: the Amazon basin, which researchers have long warned may be approaching a tipping point at which heat and deforestation transform it from rainforest into a drier, savannah-like landscape; and the Congo basin, whose forests regulate rainfall and shelter biodiversity across central Africa. The authors found that the collapse of either system would send consequences far beyond their own regions — including to British supermarkets. The UK currently imports roughly 40% of its food, leaving it exposed to disruptions in global agricultural supply chains that depend, in turn, on stable climates and functioning ecosystems. The intelligence assessment does not stop at food.

It examines the emergence of new pandemics from deforested and overexploited land, the deepening of Russian and Chinese control over critical mineral supply chains, and border disputes triggered by climate displacement. Mass migration from areas that become uninhabitable is linked, in the report's analysis, to more polarised politics across Western democracies and greater strain on public infrastructure. Nuclear war is listed as a potential — if still unlikely — end point in the most severe scenarios. Despite its suppression at home, the British government is now briefing foreign ministers in other countries on the report's findings, signalling that its authors believe collective international action is both necessary and urgent.