https://phys.org/news/2018-07-slowdown-north-atlantic-circulation-climate.html

"These results strongly suggest that the North Atlantic circulation is sensitive to disturbance, with major effects in Northern Europe," says University of Helsinki postdoctoral researcher Sakari Salonen, who headed the study.

"Our results show that the oceanic circulation was in fact perturbed the last time climate was warmer than today. This is where our study significantly adds to the prediction of future climate done based on numerical models," Salonen says.