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Solar Radius Variations and Climate Change on Earth
Reference
Rozelot, J.P.  2001.  Possible links between the solar radius variations and the Earth's climate evolution over the past four centuries.  Journal of Atmospheric and Solar-Terrestrial Physics 63: 375-386.

What was done
The author conducted a series of analyses designed to determine whether phenomena related to variations in the radius of the sun may have influenced earth's climate over the past four centuries.

What was learned
In the words of the author, the results of the analyses revealed that "at least over the last four centuries, warm periods on the Earth correlate well with smaller apparent diameter of the Sun and colder ones with a bigger Sun."

What it means
Although the results of the study were correlative and did not identify a precise physical mechanism capable of inducing significant climate change on earth, the author reports that the changes in the Sun's radius are "of such magnitude that significant effects on the Earth's climate are possible."  Surely, such findings demand that we explore them thoroughly before accepting some other phenomenon as the cause of global climate change, especially when that factor may be totally benign, or even beneficial, as in the case of atmospheric CO2 enrichment, which significantly enhances the growth of nearly all plants.