"Mike Vandeman" wrote in message
...
Harvard astrophysicist: Sunspot activity correlates to global climate
change

Well only until about 1975..

http://www.skepticalscience.com/sola...al-warming.htm

The most commonly cited study by skeptics is a study by scientists from
Finland and Germany that finds the sun has been more active in the last 60
years than anytime in the past 1150 years (Usoskin 2005). They also found
temperatures closely correlate to solar activity.

However, a crucial finding of the study was the correlation between solar
activity and temperature ended around 1975. At that point, temperatures rose
while solar activity stayed level. This led them to conclude "during these
last 30 years the solar total irradiance, solar UV irradiance and cosmic ray
flux has not shown any significant secular trend, so that at least this most
recent warming episode must have another source."

You read that right. The study most quoted by skeptics actually concluded
the sun can't be causing global warming. Ironically, the evidence that
establishes the sun's close correlation with the Earth's temperature in the
past also establishes it's blamelessness for global warming today.

http://www.skepticalscience.com/images/tsi_vs_temp.gif