(1997)human alteration of the global nitrogen cycle_causes and consequences
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8/13/2019 (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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