Chaos
Deterministic behaviour so sensitive to initial conditions that long-range prediction becomes impossible.
Why it matters now
Chaos sets an honest limit on forecasting and, crucially, does not undermine projection. Weather beyond two weeks is unpredictable while climate over decades is not, because one asks about a trajectory and the other about the shape of the attractor. Understanding that distinction defuses one of the most common arguments against acting.
Where this is happening on Earth
- North AmericaEdward Lorenz, Massachusetts Institute of TechnologyDiscovered sensitive dependence while rerunning a weather model with rounded numbers.
- AsiaMonsoon onset forecasting in IndiaSkilful within weeks, unpredictable at long range, yet seasonally projectable in the aggregate.
- EuropeEnsemble forecasting at the European Centre for Medium-Range Weather ForecastsRunning many perturbed simulations to convert chaos into usable probability.
- South AmericaEl Niño Southern Oscillation prediction from the equatorial PacificPartial predictability at six to twelve months that now guides planting across continents.
- AfricaSahel rainfall variability studiesDecadal swings that are chaotic in detail and increasingly understood in pattern.
The idea itself
The encyclopedia entry first, then live searches at journals and magazines that keep returning current work on this specific idea.
Current reporting from around the world
Standing feeds at reputable periodicals. These stay fresh on their own, which is why they are here instead of a list of articles that would be out of date within a season.