All scenarios / Earth systems
The Day After Tomorrow
Atlantic current shuts off. Europe becomes a freezer aisle.
What it is
In the film The Day After Tomorrow, the Atlantic Ocean's current system shuts down and the Northern Hemisphere freezes in days. The real system is called the Atlantic Meridional Overturning Circulation (AMOC). It carries warm water north and helps keep Europe mild. Its collapse is a genuine research concern, but it would play out over decades, not days.
Why it ranks where it does
New research suggests the AMOC could collapse at about 2°C of warming if the planet warms quickly, with a critical rate of roughly 0.3°C per decade. Models project a slowdown of around 50% by 2100. One study estimates a 10–23% chance that a collapse is already locked in. A collapse would cool northern Europe, shift tropical rain belts and raise sea levels along the US East Coast, but a flash freeze isn't possible.
Evidence on the board
- A real research topic: a weakening Atlantic overturning current. Collapse this century is debated, a flash‑freeze is pure Hollywood.
What the experts say
The IPCC rates an abrupt collapse before 2100 as "very unlikely", though newer studies have pushed that estimate up. We give it a small score because the physics is real, the effects would be severe for several regions, and it wouldn't come close to ending civilization on its own.
What would move the number
Up
- Observations showing a faster slowdown
- Warming accelerating past 0.3°C per decade
Down
- New measurements showing the circulation is stable
- Faster emissions cuts
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 Atlantic meridional overturning circulation
- Online chatter: Hacker News stories mentioning "AMOC" this week vs. the prior eight weeks
Sources
- Phys.org: AMOC could collapse near 2°C under rapid warming
https://phys.org/news/2026-08-rapid-atlantic-circulation-2c-slower.html - CNN: Atlantic Ocean circulation collapse update
https://www.cnn.com/2026/04/16/climate/atlantic-ocean-circulation-collapse-update - Arctic Today: AMOC collapse may already be locked in
https://www.arctictoday.com/amoc-collapse-may-already-be-locked-in-new-study-suggests/ - Yale Environment 360: The AMOC and climate change
https://e360.yale.edu/features/amoc-climate-change
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.