Prior to 1900,what was the major source of atmospheric carbon dioxide?

Name: Prior to 1900,what was the major source of atmospheric carbon dioxide?
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Prior to 1900, the major source of atmospheric carbon dioxide was deforestation. This is because when forests are cleared, their stored carbon is released into the atmosphere as carbon dioxide through decomposition and burning. Fossil fuel burning, rubber production, and livestock were not significant sources of atmospheric carbon dioxide prior to 1900.

Prior to 1900,what Was the Major Source of Atmospheric Carbon