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A few years back there were some coal seams that were ignited by lightning in northwestern Colorado where we were living at the time. Apparently they have been burning all over the world ever since there was a thing called coal in the ground. Reports at the time mentioned that these little understood fires account for some incredible percentage of the CO2 in the world... I can't recall what the percentage is, but it's very significant. Volcanoes probably don't produce much CO2, but they sure do pump a lot of "polution" into the atmosphere. Very sad. Volcanoes and coal seam fires are very bad.
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