Obviously the largest warming influence on the Earth is the Sun. Seems like discussion of the Sun's activity on the Earth is not mentioned as often as should be by climatologist's discussion global warming.
The Economist magazine has a good review of an article in Nature magazine about how the Sun's activity affects our global warming.
It says, "Over the three-year study period, the observed variations in the solar spectrum have caused roughly as much warming of Earth's surface as have increases in carbon dioxide emissions, says Haigh. But because solar activity is cyclic it should have no long-term impact on climate, regardless of whether similar spectral changes have occurred during previous solar cycles."
"The idea that scientists might not have quite understood the Sun's effect on climate should not provide ammunition for climate-change sceptics, says Martin Dameris, an atmospheric scientist at the German Aerospace Center in Oberpfaffenhofen."
"The findings could prove very significant when it comes to understanding, and quantifying, natural climate fluctuations," he says. "But no matter how you look at it, the Sun's influence on current climate change is at best a small natural add-on to man-made greenhouse warming."
Seems that scientists for years felt the more solar activity the greater the affect on the warming of the Earth but perhaps that hypothesis may be incorrect.
"Joanna Haigh, an atmospheric physicist at Imperial College London, and her colleagues analysed daily measurements of the spectral composition of sunlight made between 2004 and 2007 by NASA's Solar Radiation and Climate Experiment (SORCE) satellite. They found that the amount of visible light reaching Earth increased as the Sun's activity declined — warming the Earth's surface."
So as much as we believe that man's global expectorant does contribute to the warming of the Earth in some way, there are perhaps many other factors contributing as well
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