Changing sun, changing climate
Bob Carter, Willie Soon & William Briggs

Scientists have been studying solar influences on the climate for more than 5000 years.Chinese imperial astronomers kept detailed sunspot records, and noticed that more sunspots meant warmer weather. In 1801, celebrated astronomer William Herschel, the first to observe Uranus, noted that when there were fewer spots the price of wheat soared. He surmised that less “light and heat” from the sun resulted in reduced harvests.
It is therefore perhaps surprising that Professor Richard Muller (University of California, Berkeley) recently claimed that “no component that matches solar activity” could be identified in his newly reconstructed BEST global land temperature record. Instead, Professor Muller said, carbon dioxide controls our changing temperature.
Can it really be true that solar radiation, which supplies Earth with the energy that drives our weather and climate – and which, when it varied in the past, is known to have caused major climate shifts – is no longer the principal influence on climate change?
Consider the charts that accompany this article. In locations as widely separated as US, the Arctic and China, they show a strong and direct relationship between temperature and incoming solar radiation -- the data for the US coming directly from Professor Muller’s own BEST data! That such a tight relationship between temperature and solar radiation holds for many disparate geographical areas indicates that the US result cannot be dismissed as just a local aberration.
A strong sun-climate relationship requires mechanisms to exist whereby our sun can both cool and warm the Earth. One such mechanism is fluctuations in the total amount of incoming solar energy, but measurements suggest that this is not a dominant effect. Another cause, and probably a more substantial one, is modulation of the amount of solar radiation that reaches earth’s surface by changes in total cloud cover.