With regard to the question posed in the title of this thread, "Do sunspots cause climate change?" The answer is no. A correlation between A and B does not necessarily imply that one causes the other, they could both be dependent on a third factor, C. In this case sunspots do not cause earth's climate change, but both have a common cause.
Sunspots are one of the features of weather on the Sun.
The question should be, what causes the weather? on all bodies in the solar system?
As would follow from EU theory, the weather on the Sun and to a lesser extent, the planets, is caused by galactic birkeland currents. The effect of human activity is negligible.
A star is the focus of a galactic "glow discharge." The electrical energy that courses through the solar system and powers the Sun is a subtle form of energy that all of the planets intercept to some degree. Planets orbit within this discharge and intercept some of the electrical energy. Planets are minor "electrodes" within a stellar discharge envelope.
http://www.holoscience.com/news.php?article=aapprbh6
If this is the case, then climate change (if it is real) should be noticeable to some degree on other bodies in the solar system, since the causal factor is external to the solar system. Although, there may not be enough information to form any definite conclusions, there seems to be some preliminary indication that climate change is also occurring elsewhere in the solar system.
Mars Is Warming, NASA Scientists Report:
http://www.heartland.org/policybot/resu ... eport.html
Suggestive correlation between the brightness of Neptune, solar variability, and Earths temperature:
http://www.agu.org/pubs/crossref/2007/2 ... 8764.shtml
Global Warming detected on Triton:
http://www.scienceagogo.com/news/199805 ... _sys.shtml
Pluto thought to be warming up:
http://www.abc.net.au/news/newsitems/20 ... 697309.htm
New Storm on Jupiter Hints at Climate Change:
http://www.space.com/scienceastronomy/0 ... ed_jr.html
Prediction of a global climate change on Jupiter:
http://www.nature.com/nature/journal/v4 ... 02470.html
Nick