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This subset of
the cycle quantifies carbon input from fossil fuels and land use changes. It
is called the human perturbation by
the IPCC.
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It shows 5.3
billion tonnes added to the atmosphere annually from fossil fuel use.
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Humans are
converting some land to new uses adding another 1.7 billion tonnes to the
atmosphere.
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Land based
ecosystems and oceans each absorb 1.9 billion tonnes.
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The net addition
to the atmosphere is 3.3 billion tonnes.
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