It's El Nino and La Nina, Foules !! Sorry, had to say that,mate !. Anyway, I belong to the "Gulf Stream Deflection " school of thought.I first read about it some years ago,and remember being impressed by the logic of why our country, although geographically on a similar latitude to Canada, Korea,etc,had much milder winters due to the warming effect,on our surrounding ocean waters,of the Gulf Stream. The idea that melting of the North Polar ice cap,with its resultant effect on ocean currents,could influence climatic conditions in countries such as the UK,seemed to be perfectly plausible. Add to that a northward "swing" of the "jetstream" over Britain, and one could see how cold we might become ! Like now,for example !
            Of course, we in Centrally Heated Britain have got very "soft" over the last 30-40 years, turning up the heating to 20 or more degrees at the first sign of a slight frost, when all one might need to do is to be a bit more active,and wear warmer clothing.
And what is the end result of all this vastly increased gas consumption / combustion ?? Well ,I think we can all guess correctly just where that might lead us !!