Quote:
Originally Posted by freebeard
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*Earth,without an atmosphere is at equilibrium at 0-F.
*In 1870,Earth,with an atmosphere averaged +58 F at the surface,and zero-F at 20,000 feet altitude.
*In 1950,Earth averaged +59-F at the surface,and zero-F at 20,700-feet altitude.
*No other planet in the solar system has warmed,since 1870,even though exposed to the very same sun.
*The only variable is Earth's atmosphere.By default.
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Between minimum,and maximum,solar absolute total irradiance varies only 1/10th of one percent(one divided by one hundred,then divided again by ten).From physics,this variance in Btus or watts cannot explain the amount of energy absorbed by Earth to create the observed warming.James Hansen has studied this since the 1960s.The physics of global warming cannot be satisfied by the feeble difference in the visible and UV spectra falling on Earth's surface.
------------------------------------------------------------------------ Earth's got another trick up her sleeve.If the Sun DOES brighten,Stratospheric photo-chemistry produces additional ozone,which inhibits the additional UV radiation from penetrating to the ground,where it would be converted to the long-wave,infrared radiation which gets partially trapped by the greenhouse effect,acting like a living iris,which chokes down on this added incoming radiation.It's a perfectly organic process.
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Earth's other trick,is that,only a small portion of the Sun's radiation actually makes it through the atmosphere anyway.'Climate' is only 17-km thick.Above the tropopause,much of the atmosphere is completely opaque to radiation of many wavelengths.We're really only concerned with visible,UV-A,and UV-B.