Mike, it is not a closed (simple experiment) system is it?
This reminds me when environmentalists. (sierra club etc.) were up in arms (chicken little) over the trees around Mammoth Mountain which were obviously and provenly dieing from exposure to excessive CO2. Then the picketing and stomping for emission change (global warming) started. After an extensive (because to contrary hopeful beliefs) study proved that the CO2 was coming from the ground... underneath a dormant volcano, the masses quieted without accountability.
http://vulcan.wr.usgs.gov/Volcanoes/...framework.html
how does someone offset the earth as a polluter?