Not making any judegments for or against the whole Sunspots/ Co2 debacle, but there are also many other factors driving climate change much apart from our 'human' element. Galactic/ Solar/ Lunar / magnetic & Sidereal cycles to name several. Also annual sea temperatures, and Jetstream force speed and direction must be factored in.
I heard a while ago that 2008 was the 'blankest' year as far as records go on sunspot activity. Sunspot activity also drives the solar winds, which in turn drives and effects our earth weather/climate. Here's a brief NASA page about lack of Sunspot activity.
http://science.nasa.gov/science-news/science-at-nasa/2008/30sep_blankyear/
But the Earth/Solar system/Galaxy/ Milky Way etc.. are all on differing cycles too, which need factoring in.
For example
The Galactic year ( also known as a cosmic year, is the duration of time required for the Solar System to orbit once around the center of the Milky Way) this ranges from 225 to 250 million "terrestrial" years. Don't forget, the Milky Way is also moving in it's own cycle, as well as moving further away from the big bang or 'Galactic Core'.
Also there is the Sidereal Year, which differs slightly from the terrestrial year. The difference is caused by the precession of the equinoxes, which means that over long periods of time a calendar based on the sidereal year will drift out of sync with the seasons at the rate of about one day every 71 years. Which is a tiny amount on a human scale, but amounts to quite a bit over time geological time.
Knowing this, is a major reason why horoscopes can never work. The earth is NEVER in the same place in space and time EVER. Even though the seasons may make us think that we are on a yearly cycle.
So to wrap up, EVERYTHING is in a state of constant flux and movement. Weather prediction aside, it must be next to impossible to predict what's gonna happen over the millenia.
What is certain though, is that people/pollution is having a significant effect in how quickly the warming/cooling and other environmental factors are happening.
One factor that has been noticed for the last 100 years or so is the rising temperatures of towns and cities which cause 'micro climates' and 'Micro Climactic' events such as the Birmingham 'Twister' to name one.
The increasing amount of 'built up/concrete' areas increases the average and nighttime temperatures overall.
Found this which gives a break down of weather from 1650CE for about 50 years, a period of very low sunspot activity, surprisingly similar to our current weather.
http://booty.org.uk/booty.weather/climate/1650_1699.htm
Anyway, sorry to add to the confusion.
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