By - Tapas Singha.
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Global warming is the steady and continuous rise in the overall level of earth’s temperature. It has become a significant threat to the environment. It is caused by a natural process called greenhouse effect but it is intensified to its current level with some human activities. Global warming possesses threat of extreme heat, drought, flood, rising sea levels and extinction of some animal and plant species.
Global Warming is caused by a naturally appearing process called the greenhouse effect. The greenhouse effect begins with the sun and the energy it radiates to the earth. The earth and the atmosphere absorbs some of these energy while the rest is radiated back into space. Naturally occurring gases trap some of these energy and reflect it back, warming the earth. These naturally occurring gases are the so-called Greenhouse gases.
The adverse effects of global warming and greenhouse effect are being augmented due to some human activities such as deforestation and burning of fossil fuels, resulting in extreme warming. Ever since the industrial revolution began, factories, power plants and eventually cars burned fossil fuels such as oil and coal, releasing huge amount of carbon dioxide and other gases in the atmosphere.
Evidence for global warming includes a recent string of very warm years. It is reported that 1998 was the warmest year in measured history with 2005 coming in second. The shrinking of the Arctic sea ice is another example. NASA’s studies show that the Arctic sea ice has declined about 10% in the last 30 years.
The effects of global warming on plants and animals are expected to be widespread and profound. Many animals are migrating to adapt to the changing environment while species unable to do so go extinct. It is reported that to one-third of Earth's animals and one-half of plants may go extinct by 2080. Other effects of global warming can be rising sea levels, floods, severe droughts and changes of climate.
In order to stop the adverse effects of the global warming, the emissions of greenhouse gases to the atmosphere must be reduced.. Reducing the level of coal and oil burning, use of transportation means, use of electrical devices, etc may reduce the global warming to a great level. Switching to alternative sources of electricity can also help. By spreading awareness among people about the harmful impact of Global Warming in future, we can take our initiative towards the betterment of this world.
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