Lee Felich has covered this in his post on the subject. To restate: 
CO2 resulting from burning fossil fuels has a unique isotopic 
signature. Not saying that volcanic activity doesn't contribute to 
CO2 loading but you'd think it was part of the normal "background" 
variation that can be accounted for in the quoted known CO2 record 
over the last 800,000 years.

Everyone should reread Lee's post carefully if they didn't the first 
time through. It is well reasoned and covers the bases on the global 
warming discussion. Nice touch that Lee can't get funding for climate 
research :-)

Thanks Lee!

Andrew Joslin
Jamaica Plain


At 02:33 PM 4/3/2009, you wrote:

>ENTS,  With respect to everyone, what about natural events such as
>Volcanoes?http://www.geology.sdsu.edu/how_volcanoes_work/
>climate_effects.html
>Larry
>
>

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