A mysterious ‘cold blob’ in the ocean has puzzled scientists. A new study says it’s an ominous sign

By Laura Paddison, CNN (CNN) — In the North Atlantic Ocean, south of Greenland and Iceland, a large patch of water is doing something very strange. While the rest of the ocean heats up, it’s been getting colder. A new study says it has the answer to this mystery — and it’s an ominous sign