Not to worry. A mini Ice age is OTW
National geographic-Study warns Mini Ice age May be comming soon "The study supports computer model predictions suggesting that global warming will switch off the North Atlantic current in the next 50 to 100 years
Still, Quadfasel said, "This observation is really important, even though it's at the limit of accuracy. The main message, I think, is right."
Many scientists have predicted this effect. Global warming already appears to be injecting more fresh water into polar seas due to increased precipitation and the melting of the Greenland ice cap.
This freshening of the North Atlantic current makes its waters less dense—so they don't sink down to depths at which they would then be transported back south.
As result, the circulation stalls, with warmer water no longer being drawn north.
Measurements of salinity levels in the North Atlantic over the last 50 years show "a significant trend toward lower salinity all over the place," Quadfasel said.
Evidence from prehistoric times shows that it is possible for northern air temperatures to drop by 10ºC (18ºF) within decades.
These abrupt changes are intimately linked to switches in ocean circulation, experts say
New Scientist - Failing Ocean Current Raises fears of Mini Ice age "The ocean current that gives western Europe its relatively balmy climate is stuttering, raising fears that it might fail entirely and plunge the continent into a mini ice age.
The dramatic finding comes from a study of ocean circulation in the North Atlantic, which found a 30% reduction in the warm currents that carry water north from the Gulf Stream.
The slow-down, which has long been predicted as a possible consequence of global warming, will give renewed urgency to intergovernmental talks in Montreal, Canada, this week on a successor to the Kyoto Protocol"
Seems its happened before
Hoover Institution, Stanford University -Warmer Days and Longer Lives And a rather exellent read on the last one
Scott A Mandia Assoc Professor -physical sciences - The Little Ice age in Europe