- A large patch of North Atlantic water south of Greenland and Iceland — the so-called “cold blob” — has cooled about 1°C since 1900 even as the rest of the ocean warms.
- A new study links the cooling to a weakening of the Atlantic Meridional Overturning Circulation (AMOC), the ocean’s heat conveyor belt, a signal that a dangerous climate tipping point could be approaching (think colder Europe, higher U.S. East Coast seas, and disrupted African monsoons).
- Researchers say the finding strengthens the case for AMOC involvement but isn’t definitive yet — data are still sparse, so the result is worrisome and worth watching and discussing.
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