(1997)human alteration of the global nitrogen cycle_causes and consequences

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25%

50%

75%

1700 1800 1900 1975

Deforestation

CO release2

Human population

Industrial N fertilizer

Sources of Human-Caused Alteration to the Global Nitrogen Cycle
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Ammonia(NH )3

Nitric oxide(NO)

Nitrous oxide(N O)2

20%

40%

60%

80%

100%

Human-Caused Global Nitrogen Emissions
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