Fifty years ago, global cooling was causing collapse of the Gulf Stream.  Now. global warming is causing collapse of the Gulf Stream.

• Pack ice around Iceland is becoming a serious navigation hindrance to an extent unmatched since a “little ice age” in the 17th and 18th centuries.
• England’s growing season has shortened a week to two weeks since 1950 and the Arctic ice and snow cap has expanded 12 per cent since 1964.

• North Atlantic surface waters have been cooling for the last 30 years. The tepid Gulf Stream, a major warming influence on Western European weather, has retreated south about a sixth as far as it did at the height of the last full-fledged ice age, 20,000 years ago, according to ocean bed fossil records.”

Jun 15, 1975, page 250 – The Miami Herald at Newspapers.com

“Yes, global warming is considered a significant factor in the potential collapse of the Gulf Stream”