There's a strange anomaly in the North Atlantic, just south of Greenland: A 'cold blob' of ocean and air that's cooling down while the rest of the world warms up.

Weakening of a major ocean-current system is causing temperatures to drop in a patch of the Atlantic Ocean.

There's a strange anomaly in the North Atlantic, just south of Greenland: A 'cold blob' of ocean and air that's cooling down while the rest of the world warms up.

A mysterious 'cold blob' has emerged in the North Atlantic - and scientists say it indicates a critical ocean current is on the verge of collapsing.