I believe the CO2 will have some effect, but not as much as the models say. The effect is a little schizophrenic, Siberia will probably keep warming up even as Florida citrus freezes since CO2 has a relatively larger effect where it is cold and dry and almost none where it is warm and wet.
Yes, and 1998 was about the time the warmth was maximizing. The decline has already been underway for about 14 years. The paleo research seems to indicate it is quite common for an extreme cold period to be immediately preceded by an exceptional thermal maximum. Everyone should be aware that an extreme cold climate does not mean there won’t be 105F Summer extremes in certain Temperate zones. It does mean there will be some changes in cloud cover, precipitation patterns, and the latitudinal changes in climate zones.
In 1976 I was wearing jackets in the Los Angeles winters, and the air conditioner was used about 1.5 to 3 months out of the year. By 1986 the jackets stayed in the closet all year around, and the airconditioner had to be used 11 months of the year to keep the temperatures inside below 80F. Now the trend is swinging back towards the 1976 and eralier conditions.