I spent January, 2006 in Fort Collins. It was ridiculously warm, and no snow. Then I went out to work in the Bay Area for a few months, and by mid-July it was so hot that our apartment swimming pool in Cupertino warmed all the way to the bottom. Normally, summers are very cool there.
We drove back from California in mid-July and it was over 115 degrees in Sacramento. The following week was the hottest week in Fort Collins history. Global warming had clearly destroyed the climate. CO2 was trapping huge amounts of heat.
Then in September, I was coaching soccer and the weather turned cold and wet. By Christmas, we had the biggest snowstorm in Fort Collins history – and the rest of the winter was bitter cold and snowy.
Apparently, CO2 was not keeping us warm after all.