Saturday, April 3, 2010
Effects Of Pollution On Environment.
Ozone Depletion- Ozone is a naturally occurring gas found in the Earth’s atmosphere. It is an allotrope of oxygen consisting of three atoms of oxygen. 90 percent of the ozone is found in a layer and this layer is known as ozone layer. This ozone layer acts as a natural shield. Ozone absorbs most of the harmful ultraviolet rays of the sun. But now, this layer is getting depleted by a pollutant known as Chlorofluorocarbons (CFC). CFC’s are commonly used as refrigerants. Due to the increase in their emission, ozone layer is getting thinner. In the Antarctic region, it vanishes a few weeks every year.
Greenhouse Effect and Global Warming- Another important effect of pollution is the increase in greenhouse gases. The greenhouse gases admit the sun’s light but tend to reflect back downwards the heat that is radiated from the ground below, trapping heat in the Earth’s atmosphere. This process is known as greenhouse effect. If the concentration of these gases in the atmosphere increases, Earth will be much hotter than what it is now. Average temperatures have in fact been rising, and the 2000-2009 was recorded as the warmest decade. The increase in the concentration of greenhouse gases will give birth to Global Warming. A warmer world is expected to have more rain during wet periods, longer droughts, and more powerful storms. This will lead to melting of glaciers and thereby increase in the sea level. The increase in temperature will also have serious effects on plants also. It reduces the photosynthesis by phytoplankton in aquatic ecosystem.
Acid Rain- Acid rain refers to the rainfall with pH value less than 5.0. Sulfur trioxide on reaction with water produces sulfuric acid and this is the principle reason for acid rain. Burning of fossil fuels will produce sulfur which then oxidizes to form sulfur trioxide. Other substances which can cause acid rain are nitric acid, hydrochloric acid and carbonic acid. Its after effects include damage to vegetation, corrosion of buildings and destroys aquatic organisms. Its presence can be life threatening to fish and other aquatic organisms.
Posted by Kalesh