Scientists have observed a slowing of the Gulf Stream that is part of the Great Ocean Conveyor Belt.
The Gulf stream keeps Western Europe 10 degrees warmer all year round. If the Gulf Stream stops (which it has done in the past). Ireland, Uk, France, the Mediteranean et al, are likely to share the climate of Sibera which is a simliair distance from the Equator.
To see an interactive guide visit.