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Nature 401, 752-755 (21 October 1999) | doi:10.1038/44486

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Carbon cycle: The blast in the past

Gerald R. Dickens

On current estimates1, 2, 3, over a period of less than a thousand years 2,000–4,000 gigatonnes of carbon will be added to the atmosphere by human activity. That's 2–4 billion billion tonnes.