Re: More on global warming, etc

[Bernard L Cohen <blc+@PITT.EDU>]

On Thu, 26 Apr 2001 RuthWeiner@AOL.COM wrote:



> CO2 in the air behaves like an ideal gas and moves freely in space and 

> radiates (and absorbs) isotropically.  Is the "global warming" effect 

> preferential re-radiation back to the earth's surface, and if so, why? 



	--There is no preferential direction, so about half of the

radiation is back toward the Earth. If there were no greenhouse gases,

none of it would be radiated back toward the Earth and all outward

directed radiation would escape. That is why greenhouse

gases raise the temperature of the Earth



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