How have humans impacted the natural cycle of nitrogen?

Human activities, such as making fertilizers and burning fossil fuels, have significantly altered the amount of fixed nitrogen in the Earth's ecosystems. ... Increases in available nitrogen can alter ecosystems by increasing primary productivity and impacting carbon storage (Galloway et al. 1994).

Explanation:

The nitrogen cycle affects humans in multiple ways.

All living organisms require nitrogen. It is an essential part of plants, nitrogen makes up amino acids, and amino acids are what create proteins, and nitrogen is a crucial component of nucleic acids also. The images below show the chemical composition of nucleic acids:

photosynthesis makes the glucose that is used in cellular respiration to make atp. the glucose is then turned back into carbon dioxide, which is used in photosynthesis. while water is broken down to form oxygen during photosynthesis, in cellular respiration oxygen is combined with hydrogen to form water.