How do the Carbon and
Nitrogen Cycle contribute to
Human Impact issues?

The natural carbon cycle is composed of many processes that cancel each other out over time. An input here is balanced by an output there; a gain today by a loss tomorrow.

By burning fossil fuels we add a new carbon source. That source is relatively small, but it is not balanced by anything. The result is that the net amount of carbon in the atmosphere creeps up from year to year. Your might say the “cycle” becomes more like a spiral.

Carbon dioxide, methane, and nitrous oxide contribute most of the human-caused increase in climate forcing, and the nitrogen cycle affects atmospheric concentrations of all three gases. ... Roughly 60% of agricultural N2O derives from elevated soil emissions resulting from the use of nitrogen fertilizer.

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