Human activity has affected every aspect of the nitrogen cycle. List the ways th

Humans have spent a great deal of money on producing and distributing nitrogen and have doubled the amount of nitrogen available for use by plants. The Haber-Bosch process allows us to fix nitrogen into usable molecules. We have increased the amount of nitrogen that makes its way into waterways, mostly as runoff from fertilizer. This has caused alterations in terrestrial community composition and eutrophication in water systems. We have also increased the distribution of nitrogen through atmospheric pollution, primarily from nitrogen oxides resulting from burning fossil fuels, that then comes down as acid rain. Concerns for the future include climate change through increased concentrations of nitrous oxide, a greenhouse gas, depleted nutrients from soils, and acidified surface water and soils.