Hayduke: Its anthropogenic. You can read about it in the IPCC FAQs. Or you can track down some real papers on the subject.
To identify what the source of the carbon was, they carbon dated the atmosphere. If old carbon were to be introduced to the atmosphere, the readings would decline. (Because the carbon being put in the atmosphere would have a lower radioactive component. Older Carbon, lower C14.)
Other sources are easier to identify.. deforestation.. etc.
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