The Polycrisis Apocalypse

This report defines and examines the Polycrisis Apocalypse, a term coined by H Heuristics for a scenario in which multiple interconnected global crises intensify and reinforce one another beyond humanity’s capacity to manage them, triggering cascading systemic failures that end in the collapse of industrial civilisation and a prolonged period of societal regression lasting centuries or millennia. Unlike a conventional apocalypse, it has no single cause or moment. It is a process, and the report argues that its decisive variable is the balance between two rates: the rate at which interacting crises add stress, and the rate at which a civilisation’s institutions, infrastructure and finance repair it.

The historical record shows that such regressions are common and slow. In the Mycenaean world, writing disappeared with the palaces around 1200 BCE and did not return for roughly four and a half centuries; Roman-era lead pollution recorded in Greenland ice fell with the Antonine Plague of 165 CE and did not regain its level for more than 500 years; Egypt’s First Intermediate Period lasted about 125 years. Survival analysis of premodern states finds that their risk of termination rises over the first two centuries of their existence, and one survey of past civilisations puts their average lifespan at about 336 years. Collapse, in this record, is a loss of complexity rather than of people, and recovery is measured in generations.

A stress–repair model makes the mechanism explicit. Crises arrive at random and add stress; capacity repairs stress but saturates when stress is high; stress erodes capacity; and amplification between crises depends on how interconnected the system is. The model has a sharp threshold. At its default settings, 91 per cent of 300 simulated runs collapse within 1,000 years and the median dark age lasts 471 years, but raising repair capacity by a sixth cuts that share to 27 per cent, loosening coupling cuts it to 10 per cent, and a combination of levers removes it entirely. Faster rebuilding, through preserved knowledge and institutions, does not prevent collapse but reduces the share of time spent collapsed from 51 to 19 per cent. The model is illustrative, not a forecast.

Today’s ledger shows stress rising on most of the ten crisis domains in the definition — seven of nine planetary boundaries breached in 2025 against three in 2009, 65 state-based armed conflicts in 2025, 673 million people hungry in 2024 — while several measures of repair capacity weaken: official development assistance fell 23.1 per cent in real terms in 2025, the largest drop on record, and global human development gained 2.75 thousandths a year in 2019–2023 against 5.6 in the 2000s. Modern societies still recover fast, as the return of life expectancy after the pandemic shows. The report concludes that the Polycrisis Apocalypse is avoidable precisely because it is a race: the levers that keep repair ahead of stress — reducing shocks at source, loosening the couplings between systems, sustaining the capacity to repair, and preserving the means to rebuild — are known, and the model shows they compound.

This Word edition adds two things. It sets the concept beside human extinction — the adjacent and final category of risk — and argues that a long regression is not safely separated from it (Section 2.7). And it assesses the present trajectory (Section 12): with stress rising on six of ten fronts and measured repair capacity slowing, on current trajectories the world may be heading toward a Polycrisis Apocalypse. The evidence establishes the direction of travel, not a date or a probability.