| http://www.w3.org/ns/prov#value | - Then we have to?? add in?? the carbon emissions from (1) the First Lady???s separate flight plus?? (2) what we can assume would have been at least two cargo planes that fly ahead of Air Force One to provide the president with such items as vehicles for his motorcade.?? ?? ?? These three planes are estimated to have a warming effect of CO2 of 2,178 tons?? ??? a ?? conservative estimate because it a
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