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Excess, or additional carbon dioxide is added to the atmosphere only by the burning of fossil fuels (coal, oil and natural gas), and a very small amount from volcanic activity.

All other carbon dioxide moves in and out of the oceans, atmosphere and land as part of the normal carbon cycle, which includes the growing and dying of vegetation.

Fossil fuels release carbon dioxide that was taken out of the atmosphere (when the vegetation grew) 300 million years ago, so it is extra.

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