Humans interfere the natural balance in many ways. Let’s understand some of them.
I. Excessive use of nitrogen containing chemical fertilizers in the agriculture and untreated domestic sewage which are often washed into water bodies such as streams and rivers and even seep down to groundwater before these nitrates can be converted into atmospheric nitrogen. Water with high concentrations of nitrates is unsafe for consumption for humans and animals.
II. The excessive amount of nitrates in the rivers and lakes, cause too much algae growth called algal boom. Too much algae use oxygen in the water. When oxygen level falls, other organisms of water die.
III. Human activities such as clearing of forest and land use that interfere in the natural carbon cycle. Burning of forest trees release huge amount of carbon dioxide in the atmosphere as well as by clearing trees the carbon dioxide is not used in the photosynthesis. Since carbon dioxide is a primary greenhouse gas, the increase in atmospheric CO2 due to human activities has resulted in an enhanced greenhouse effect resulting in higher global temperatures.
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