Background
The authors note that Manabe et al. (1991) and others have proposed that global warming may lead to a substantial weakening of the meridional overturning circulation (MOC) in the North Atlantic Ocean that helps to drive the global ocean's thermohaline circulation (THC). This proposed phenomenon is one of the tipping points that climate alarmists claim could raise havoc with earth's climate at almost any time. So what's happened in this regard over the last few decades, when climate alarmists claim the earth has warmed to a level that NASA's James Hansen contends is close to the all-time high of the prior million or more years?

What was done
Noting that "variations of the MOC on multidecadal and longer time scales are accompanied by a characteristic inter-hemispheric SST anomaly pattern, with anomalies of opposite signs in the North and South Atlantic, Latif et al. investigated this question by means of an Atlantic dipole sea surface temperature (SST) anomaly index that "was computed from 1900 onward using observations (Rayner et al., 2003)."

What was learned
This protocol revealed, in the words of the seven researchers, that "indications of a sustained THC weakening are not [our italics] seen during the last few decades." Instead, as they continue, "a strengthening [our italics] since the 1980s is observed."

What it means
Over the last few decades, when the world's climate alarmists and certain scientists claim the planet's mean temperature rose at an absolutely incredible rate, and to an absolutely incredible level of warmth, the global ocean's thermohaline circulation appears to have done just the opposite of what they have adamantly been predicting it would do.

Need we say more?

References
Manabe, S., Stouffer, R.J., Spelman, M.J. and Bryan, K. 1991. Transient response of a coupled ocean-atmosphere model to gradual changes of atmospheric CO2. Part I: Annual mean response. Journal of Climate 4: 785-818.

Rayner, N.A., Parker, D.E., Horton, E.B., Folland, C.K., Alexander, L.V., Rowell, D.P., Kent, E.C. and Kaplan, A. 2003. Global analyses of sea surface temperature, sea ice, and night marine air temperature since the late nineteenth century. Journal of Geophysical Research 108: 10.1029/2002JD002670.