Enviornmental Science Essay

462 WordsOct 28, 20122 Pages
• Discuss how humans impact each cycle. • Give specific examples of each cycle and how humans impact these cycles. According to the law of conservation of matters, atoms cannot be created or can they be destroyed. To me it feels as if recycling is the only way to maintain a dynamic system. We now have to focus on the pathways of three key elements heavily affected by human activities: carbon, phosphorus, and nitrogen. The human impacting the carbon cycle is significant when burning fossil fuels. We are increasing the atmosphere carbon dioxide by 35% over preindustrial levels. By the mid 20th century deforestation and soil degradation released significant amounts of CO2 to the atmosphere. The phosphorus cycle carries the most serious human intrusion coming from the use of phosphorus containing fertilizers. The human applications have really tripled the amount of phosphorus reaching the oceans from the natural level of about (8 million metric tons) of phosphorus each year. There is really no way to return the waterborne phosphorus to the soil, so therefore the bodies of water end up over fertilized. This is not a good thing because it leads to a severe water pollution problem known as eutrophication which can cause the overgrowth if algae, the death of fish, and too much bacteria. The human impact of the nitrogen cycle involvement is substantial. Many agricultural crops are legumes, peas, beans, soybeans, alfalfa and they each draw nitrogen from the air. Corn, wheat, potatoes, cotton and so on are no leguminous are heavily fertilized with nitrogen derived from industrial fixation. Fossil fuels also combustion fixes nitrogen from the air. Examples of all cycles are that they differ in some ways and with the carbon cycle, through the photosynthesis and further metabolism, carbon atoms of the organic molecule making up a plant’s body. They can then be eaten and

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