Marine heat waves can trigger coral bleaching.
              Alexis Rosenfeld/Getty Images

It’s official: El Niño is back. By late fall 2026, forecast models give a 2-in-3 chance of a strong-to-very strong El Niño affecting the weather, climate and ocean temperatures across the planet.

El Niño is the climate system’s biggest player and one side of the El Niño-Southern Oscillation, or ENSO. It’s the heads to La Niña’s tails.

Originally published on theconversation.com, part of the BLOX Digital Content Exchange.

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