Researchers have considered the possibility that the sun plays a role in global warming.
From NASA GSFC: Solar Variability and Terrestrial Climate
In the galactic scheme of things, the Sun is a remarkably constant star. While some stars exhibit dramatic pulsations, wildly yo-yoing in size and brightness, and sometimes even exploding, the luminosity of our own sun varies a measly 0.1% over the course of the 11-year solar cycle.
From the "We've been trying to tell you" department. The exact mechanism may be in dispute, but it defies reason to assert that that great big ball of flaming plasma in space has less influence on the Earth's climate than the very questionable influence of human-introduced CO2. Very interesting article, well worth reading.
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