European Oxeanic Circulation Drying Up?

Could it be true? While it sounds like the run up to a bad sci-fi movie, it appears that the cold side of the deep ocean currents that convery warm water back to the surface in Europe, may be slowing down substantially. These deep cold currents bring water to the warmer equatorial regions, where warm water is displaced, flowing back to European waters, resulting in unusually warm water for their distance from the equator. Especially troubling is Europes dependence on agriculture in the regions that would be hit the hardest by a dip in temperature.

This (huge) video shows a pretty good explanation of the entire system.

Incidentally, there is historical evidence that this has happened before. Natural climate change caused a "similar" plunge to low temperatures over a very short timespan. Evidently we should be careful of our own effects, since the climate is fragile enough without our interference...