i have stated it before, and i will state again, this is probably just a blip to the system with a strong la nina, as many people have stated before, if next year has a negative NAO then im sure a milder blip is not too far away. the question is, will these strong la ninas that we are currently experiencing get stronger in the future. if so, then these cold winters will become more common, and of course, the cold winters will not be so evident in the uk. however, if el ninos gather strength, which is more unlikely, then global temperatures will be higher, and people will start to worry about AGW once more. for us to determine what the temperature around the world is likely to be come 20 years, we need to know the effects of CO2 on the stratospheric system, pressure systems, the NAO and el/la nino/a.