Types of Greenhouse Gases :-
In the environment, greenhouse gases occur
(i) naturally or (ii) from human activities.
The most abundant greenhouse gas is carbon dioxide. It reaches the
atmosphere due to volcanic eruptions, respiration of animals, burning and decay
of organic matter such as plants. Normally carbon-dioxide is removed by the
plants by photosynthesis. Carbon-dioxide is also absorbed into ocean water. But
humans by their activities increase the release of carbon dioxide into the
atmosphere . Such activities include burning of fossil fuels, solid wastes,
wood and wood products to drive vehicles, generate electricity etc. At the same
time due to deforestation, the number of trees available to absorb
carbon-dioxide through photosynthesis has been greatly reduced.
Human activities have caused carbon - dioxide
to be released to the atmosphere at rates much faster than that at which earth's
natural processes can recycle this gas. There were about 281 molecules of
carbon-dioxide per million molecules of air (i.e., parts per million or ppm) in
1750. Today atmospheric carbon-dioxide concentrations are 368 ppm, a 31% increase.
Methane traps 20 times more heat than
carbon-dioxide. It is emitted during the production and transport of coal,
natural gas and oil. It is also emitted from rotting organic waste in sand
fills, by the cows as a by product of digestion. Since 1750, the amount of
methane in the atmosphere has more than doubled.
Nitrous Oxide traps 300 times more heat than
carbon-dioxide. burning fossil fuels and ploughing farm soils releases nitrous
oxide. Since 1750 its level increased by 17%. Hydrocarbons formed from the manufac-ture of foams, coolants such
as chlorofluorocarbons used in
refrigerators are the other gases responsible for global warming.
Related Topics
Privacy Policy, Terms and Conditions, DMCA Policy and Compliant
Copyright © 2018-2024 BrainKart.com; All Rights Reserved. Developed by Therithal info, Chennai.