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effects of human activities on environment

EFFECTS OF HUMAN ACTIVITIES ON ENVIRONMENT

Grecy House Effect 


effects of human activities on environment

The Green House Effect is a process in which the heat radiations leaving the earth's surface are absorbed by some atmospheric gases (Carbon dioxide and Methane), called Green House gases. Energy radiated by the sun converts into d the heat when it reaches the earth.


Some heat is reflected back through the atmosphere while, some is absorbed by atmospheric gasses and radiated back to the earth and causes increase in earth's temperature. Transfer of this heat energy to the atmosphere, and its re-radiation in all directions, including downward to the surface of earth is called Green House Effect.


Global warming is believed to be the result of increased greenhouse effect.

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Global Warming


Global Warming refers to the increase in the temperature of the earth due to release of greenhouse gases like carbon dioxide and methane from industries and vehicles. Because, of this causing, glaciers are melting alarmingly.The result an increase in the sea level, which is danger to low lying areas.


Some of the areas that may go under the sea if the sea levels kept on increasing include Bangladesh, parts of Africa and even the major cities like London and New York.


Acid Rain


Acid rain Acid rain is caused by a chemical reaction that begins when compounds such as sulfur dioxide and nitrogen oxide are released into the air, where they mix and react with water oxygen and other chemicals to form more acidic Lone pollutants known as acid rain.


Usually rain water is slightly acidic because in the atmosphere. water and Carbon Dioxide react each other and formed Carbonic Acid. In the pollutant air Sulphur Dioxide and Nitrogen Oxide are included in addition to Carbon Dioxide. 


When these gases dissolved in rain water it formed Sulphuric Acid (H₂SO₄) and Nitric Acid (NHO₃) respectively. This cause the Acid rain. Since Acid rain is equally harmful to living organisms non Living components.


Causes;

The most prominent gas which leads to acidification is sulphur dioxide (oxidized to sulphuric acid) and nitrogen oxides (oxidized to nitric acid). These are emitted from fossil fuel combustion, industry, wildfires and volcanoes.

In addition, the exhaust from cars, trucks and buses releases nitrogen oxides and sulphur dioxide into the air, thus pollutants causes acid rain.


Depletion Of Ozone Layer


Ozone layer is a deep layer in the upper part of the earth's atmosphere contain ozone (O₃). It is a naturally occurring molecule having formula O₃.This layer protects us from the ultraviolet rays of the sun.However,as the Ozone layer enter the earth's atmosphere,it filters out dangerous UV rays from sunlight.As the harmful (CFCs) chemicals are released, they rise up into the atmosphere and break down the Ozone molecules.There is an Ozone hole in Antarctica, which has become a concern for environmentalists. 


The depleting ozone layer is not only harmful to human beings but the UV rays can also destroy a certain type of bacteria. These bacteria are known as Cyanobacteria which are important for many crops.


 Researchers are even predicting that excess level of UV rays could lead to the death of the phyto-planktons that are important component of the food web of the water ecosystem.


Deforestation


Expanding population,industrialization and need of land for development of expanding eities has led men to cut down trees selfishly. So, the permanent removal of trees, or culting is called Deforestation".

Not only are The forests are not only habitat of a large number of animals, but also act as important component of the water cycle. The roots of plants Hold the soil particle together and prevent soil erosion.


Deforestation has increased rapidly in the Last 50 years and it is increasing day by day. Deforestation occurs around the world. (NASA) predicts if the current deforestation proceed, the world's rained forests may vanish in next as in 100 years.


Deforestation causes many problems, some of which are as:


  • Soil erosion
  • Green House Effect
  • Air pollution


Conservation Of Resources


Conservation Is the protection and reservation of natural resources in environment"


Natural resources are those materials or components which are found in the environment. Many of them are essential for our survival while others are used to satisfy our needs. With respect to renewability, natural resource can be

categorized as follows:


Renewable resources


Almost these resources are reproduced naturally like the sunlight, air, wind, etc. are Constantly available and their quantity is not affected by human consumption. However many renewable resources can be depleted by human use, but may also be reproduced. For example, agricultural crops take a short time for renewal, water take a comparatively longer time, while still others like forests, take even longer time.


Non-renewable resources: 


It becomes very long geological periods.Minerals and fossil fuels fall into this category. Since their formation speed is extremely slow.They cannot be reproduced once depleted. Minerals can be re-used by recycling them but coul, natural gas and petroleum cannot be recycled.


 Why should we conserve the resources?


  • To ensure the protection of plants and animal species and to prevent their extinction.
  • To maintain a stable and balanced ecosystem.
  • To ensure the conservation of marine life.
  • To ensure the function available of resources to the generation.
  • To ensure equitable and sustainable development of present and future generations and to meet the generation for their survival


Conservation Measures


We can conserve our resources.


By educating the people about the protection of natural resources.


By promulgation of laws that covers the protective conservation of nature,




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