| Increase of N2O Concentration |
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| q | The
atmospheric concentration of nitrous oxide (N2O) has |
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| increased
by 46 ppb (17%) since 1750
and continues to |
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| increase.
The present N2O concentration has not been |
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| exceeded
during at least the past thousand years. |
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| q | About a third of current N2O emissions are
anthropogenic |
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| (e.g.,
agricultural soils, cattle feed lots and chemical |
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| industry). |
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