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Throwing fewer pollutants into the air is a good thing, but is CO2 a pollutant?  We exhale it.  We know that man's use of fossil fuels creates CO2, which is added to the atmosphere.  Volcanoes do the same.  Plants consume CO2 and reduce its total atmospheric quantity.  And an increase in CO2 causes the growth of more plants that want to consume it.  Most of the world's CO2 is a component of ocean water.  A natural warming cycle warms the oceans, which releases additional CO2 from ocean water into the atmosphere, so how do we know whether the CO2 is increasing because of what man is adding and thus causing warming; or whether natural warming is causing the oceans to release CO2, which then shows as an atmospheric increase?Considering this ever changing, complex system of CO2 production and consumption, do we really know the total quantity of CO2 in the earth's ecosystem and whether it is increasing or decreasing?
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