Read here. The IPCC predicted, using its climate models, that it was "likely" that the melting ice of Greenland, due to CO2-caused global warming, of course, will cause cold, fresh water to flow into the Atlantic Ocean disrupting major currents, including slowing down the AMOC (Atlantic meridional overturning circulation). Hollywood climate scientists even made a movie about this subject, backing up the IPCC Climategate scientists' predictions. As usual though, actual science and empirical evidence makes a shambles of the joint IPCC/Hollywood predictions.
A new study by Zhang et al. analyzes the AMOC using the North Brazil Current as a proxy and confirms that the AMOC is not slowing down due to any modern Greenland ice melt. Their research did indicate though that the AMOC has a cyclical behavior on a decadal scale, which puts its behavior in the realm of natural oscillations, not CO2-based, like the fictional IPCC/Hollywood "science" that coastal elites believe and solely rely on.
"There has been debate as to whether the AMOC (Atlantic meridional overturning circulation) has begun slowing down due to global warming, but research on AMOC variability based on instrumental records is limited. One possible indicator of change in the AMOC is the North Brazil Current (NBC)...The researchers therefore suggest that observed NBC variability is a useful indicator of AMOC variations. They confirm this using a climate model simulation. Furthermore, the authors note that although some studies have suggested that the AMOC is slowing down due to global warming, the NBC shows multidecadal variability but no significant slowing trend over the past 50 years." [Dongxiao Zhang, Rym Msadek, Michael J. McPhaden, Tom Delworth 2011: Journal of Geophysical Research-Oceans]
Additional failed-prediction, oscillation-current and peer-reviewed postings.