How Humans Impact Each Cycle

Topics: Carbon dioxide, Oxygen, Carbon Pages: 2 (288 words) Published: March 7, 2013
Tasheba Wright
EVS 1001-118
Professor Henry
Week 2
Individual assignment
How Humans Impact each Cycle

How humans impact each cycle
Carbon cycle
In the carbon cycle, plants absorb carbon dioxide from the atmosphere and use it, then through photosynthesis carbon atoms from carbon dioxide becomes “the carbon atom of the organic molecules” (Wright & boorse, 2011) making up a plant’s body that it can be eaten. Humans impact the carbon cycle by deforestation causing global warming and burning fossil fuel such as oil, coal, and natural gas which increases atmospheric carbon dioxide. Phosphorus cycle

In the phosphorus cycle phosphorus is very important and needed for all plant growth. Phosphorus that plants use is contained mostly in the earth crusts and “this slow process is the normal of replenishing phosphorus that is lost because of runoff and leaching.” Humans impact the phosphorus cycle by the use of manmade phosphate fertilizers “to a severe water pollution this in turn leads to a severe water pollution problem known as eurtophication” (Wright & boorse, 2011) which causes overstimulation. Nitrogen Cycle

Nitrogen is very important to all living cells, it enters the food web through nitrogen fixation which “can be used by plants in building amino acids and other nitrogen containing organic molecules.” (Wright & boorse, 2011) Humans have interfered with the nitrogen cycle by dumping sewage and urban runoff, burning fossil fuels and wood, overharvesting of legumes and nitrogen-rich mines which in turn causes global climate change, ozone pollution, and stratospheric ozone depletion.

References
Wright, R. T., & Boorse, D. F. (2011). Environmental Science Toward A Sustainable Future 11e. In R. T. Wright, & D. F. Boorse, the Cycling Of Matter in Ecosystems (pp. 68-70). San Francisco: Pearson.
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