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  (Source: Smart Power)
Study says skeptics are not well-informed on the topic

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Man vs Sun?
By nmrahde on 6/28/2010 12:17:05 PM , Rating: 3
Has anybody seen any research (papers, studies, shiny pie graphs, etc.)

That compare how much of the overall temperature increase is due to humanity's influence and how much is due to the sun continuing to increase in power?

I thought I read a while back that the sun is continuing to increase it's output (I don't remember exactly where as "a while back" = over a decade ago), but I could be wrong.

RE: Man vs Sun?
By SRHelicity on 6/28/2010 12:29:25 PM , Rating: 2
In general, changes in solar luminosity do affect global mean surface temperatures, but that affect has been much smaller than the anthropogenic forcing.

Changes in the Sun's brightness over the past millennium have had only a small effect on Earth's climate, according to a review of existing results and new calculations performed by researchers in the United States, Switzerland, and Germany.


Warming by the Sun and other variations in natural systems cannot explain global warming... The simulations that include only natural variability, including changes in the Sun and eruptions of volcanoes, show that we should have seen a decrease in the global average temperature in the last several decades.

The simulations that most closely resemble the observed record are the ones that take the cooling effect of air pollution and the warming effect of greenhouse gases into account.

According to Shindell, the new study also confirms that changing levels of energy from the sun are not a major cause of global warming.

Many scientists have argued that the radiation change in a solar cycle — an increase of two to three tenths of a percent over the 20th century — are not strong enough to account for the observed surface temperature increases. The GISS model agrees that the solar increases do not have the ability to cause large global temperature increases, leading Shindell to conclude that greenhouse gasses are indeed playing the dominant role.

RE: Man vs Sun?
By jbartabas on 6/28/2010 12:30:02 PM , Rating: 2
RE: Man vs Sun?
By nmrahde on 6/28/2010 6:26:33 PM , Rating: 2
Thanks for the links!

"So if you want to save the planet, feel free to drive your Hummer. Just avoid the drive thru line at McDonalds." -- Michael Asher

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