After decades of dormancy, this climate force may be tipping toward chaos.

Scientists are increasingly focused on the Atlantic Multidecadal Oscillation (AMO)—a natural climate cycle that toggles North Atlantic sea temperatures between warm and cool phases every few decades. Recent studies show a warm phase may begin soon, and although it’s about 1 degree F of ocean temperature variation, its global repercussions could be profound.
As geophysicist Nour‑Eddine Omrani of the University of Bergen cautions, “The next multidecadal warming will start from a higher level and lead to unprecedented warming and associated extremes.” The AMO’s re‑awakening will likely magnify climate impacts already underway, and understanding its influence could make the difference between being overwhelmed—or prepared—for what’s coming.








