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	Name:	MartiniMan -
	Subject:	Question
	Date:	12/29/2008 10:35:52 PM

Either source is actually not important in the scheme of things. CO2 comprises only about 0.038% of air so what that means is for every 100 pounds of air, CO2 equals 0.00038 pounds. So when you hear the alarmists they always want to talk about the % increase of CO2 from anthropogenic (man-made) sources and never the amount of CO2 in the atmosphere because even a non-scientist intuitively recognizes that something that comprises such a small portion of the overall atmosphere (as a greenhouse gas) would have negligable impact when compared other significantly Interestingly the most abundant greenhouse gas in the atmosphere is water vapor which varies significantly but is generally around 4% or over 100 times more than CO2. So water vapor concentrations go up and down all the time and significnatly greater concentrations than CO2 but we are worried up changes in a miniscule molecule that cooincidently is associated with hydrocarbons.