More on the Sun | Climate Skeptic

I wouldn’t say that I am a total sun hawk, meaning that I believe the sun and natural trends are 100% to blame for global warming. I don’t think it unreasonable to posit that once all the natural effects are unwound, man-made CO2 may be contributing a 0.5-1.0C a century trend (note this is far below alarmist forecasts).

But the sun almost had to be an important fact in late 20th century warming. Previously, I have shown this chart of sunspot activity over the last century, demonstrating a much higher level of solar activity in the second half than the first (the 10.8 year moving average was selected as the average length of a 20th century sunspot cycle).