All scenarios / Earth systems
Ecological Collapse
First the bees go. Then the almonds. Then us.
What it is
Ecological collapse is the breakdown of the natural systems that humans depend on: pollinators, fisheries, soils, forests and freshwater. The fear is that losing species and habitats eventually crosses a threshold where these systems stop providing food, clean water and a stable climate.
Why it ranks where it does
The landmark IPBES Global Assessment found that around 1 million animal and plant species are threatened with extinction, many within decades. More than 40% of amphibian species and about a third of reef-building corals are threatened. That's slow-moving but well documented, so we score it on long-run scientific consensus rather than this week's headlines.
Evidence on the board
- Slow‑moving and well documented; scored on long‑run scientific consensus rather than this week's news.
What the experts say
Ecologists warn that damage to nature is accelerating, but they generally describe ecological collapse as a regional, gradual threat rather than a sudden global event. It ranks in the middle of the board because the risk is real but slow, which gives humanity time to respond.
Could we survive it?
Past mass extinctions unfolded over thousands to millions of years. Today's losses are happening much faster, mostly because of land-use change, overfishing, pollution, invasive species and climate change. Humanity depends on nature for pollination, fish protein, fertile soil and clean water, and losing these services would mean higher food prices, poorer health and more conflict. Ecologists also stress that ecosystems can recover when pressure is removed, as protected areas and restored fisheries have shown.
What would move the number
Up
- Widespread coral-reef die-offs
- Pollinator collapse affecting crop yields
- Major fisheries collapsing
Down
- Meeting the global 30x30 protection targets
- Recovery of key species and habitats
Live signals we track
The baseline above is set from the evidence as of October 13, 2026. On the live board, your browser adjusts it in real time using these feeds. Chatter can only nudge a score in proportion to its evidence, so attention alone can't make an unlikely scenario look likely.
- Public attention: daily Wikipedia pageviews for Holocene extinction
- Online chatter: Hacker News stories mentioning "biodiversity" this week vs. the prior eight weeks
Sources
- IPBES Global Assessment media release
https://www.ipbes.net/news/Media-Release-Global-Assessment - WMO: Climate change cited in landmark report on nature's decline
https://wmo.int/media/news/climate-change-cited-landmark-report-natures-dangerous-decline
Baseline scores are an editorial threat index from 0 to 100 that combines current reporting with published expert estimates. They're meant for comparing risks, not as actuarial forecasts. See how the numbers work.