Updated, 21st September 2015
I particularly like the last scene from TDAT.
WHOI has studied the Irminger Sea and continues the study as part of the Ocean Observatories Initiative. This is why. The mechanism in question has a recent history of being intermittent.
Update, 5th November 2015
Professor Rahmstorf has a reasonable optimistic op-ed in the Sydney Morning Herald regarding both the COP21 talks in Paris, and the ability of nations like Australia to turn things around. He also notes that it has been nearly 50 years since the problem of human-caused climate disruption was brief ed to American President Lyndon Johnson.