Should You Worry About the Gulf Stream
The answer is complicated. Here are three articles addressing the topic:
Abrupt Climate Change
"Abrupt climate change" describes changes in climate that occur over the span of years to decades, compared to the human-caused changes in climate that are occurring over the time span of decades to centuries.
How Climate Change Could Jam The World's Ocean Circulation
Scientists are closely monitoring a key current in the North Atlantic to see if rising sea temperatures and increased freshwater from melting ice are altering the “ocean conveyor belt” — a vast oceanic stream that plays a major role in the global climate system.