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It’s the Sun, Stupid! By Dr. Willie Soon The theory that climate change is chiefly caused by solar influences “is no longer tenable,” says US National Academy of Sciences president Ralph Cicerone. Carbon dioxide, he argues, is the key driver of recent climate change. I beg to differ. The amount and distribution of solar energy that we receive varies as the Earth revolves around the Sun and also in response to changes in the Sun’s activity. Scientists have now been studying solar influences on climate for 5000 years. Chinese imperial astronomers kept detailed sunspot records. They noticed that more sunspots...

How much of an influence the sun has exerted on earth's climate during the 20th Century is a topic of heated discussion in the area of global climate change.  The primary reason for differing opinions on the subject derives from the fact that although numerous studies have demonstrated significant correlations between certain measures of solar activity and various climatic phenomena (Reid, 1991, 1997, 1999, 2000), the magnitude of the variable solar radiative forcing reported in these studies is generally so small it is difficult to see how it could possibly produce climatic effects of the magnitude observed (Broecker, 1999).  Supporters...