Another report came out recently presaging the dangers to the Atlantic currents that transport warm tropical warm water from the gulf and tropical regions to the North Atlantic Ocean; and the cold weather from the North Atlantic to the tropics and the gulf.
These currents help regulate climate for a large portion of the world. It is the reason the England feels balmy while London has the same latitude as southern Alaska.
The breakdown of the North Atlantic currents such as the Gulf Stream would have devsstating consequences for places like England and Scandinavia. It would also set off a cascading effect around the world throwing everything off kilter.
Below is an image of the Gulf Stream courtesy of NOAA. And below that a video.