I once researched this for another purpose. My recollection is that
the US military accounts for about 2-3% of total US carbon emissions.
Those are actually fairly large numbers of a per soldier basis (120,000
soldiers in Iraq vs. 300 million civilians at home), but in absolute
terms, wartime activities are not a major contributor to global
warming.
And no, the collective energy from bombs and the like is totally
insignificant compared to the greenhouse effect. In fact, if you take
away the energy trapping effect of greenhouse gas emissions, the direct
energy content of all fossil fuels being burned is not enough to
appreciably warm the Earth.
-Robert A. Rohde
http://www.globalwarmingart.com/
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