Ozone Layer Depletion

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  • Topic: Ozone depletion, Chlorofluorocarbon, Ozone
  • Pages : 8 (2362 words )
  • Download(s) : 614
  • Published : May 4, 2012
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Ozone Layer
Depletion
[ Language & Communication Skills ]

Contents

Abstract| 1|
Introduction| 2|
Findings: Factor of ozone depletion| 3|
Effect of ozone depletion| 4|
Solution of ozone layer| 5-6|
Conclusion| 7|
Recommendation| 8|
References| 9-10|
Appendices| 11-13|
Bibliography| 14|

Abstract

Ozone is concentrated in the ozone layer , which is located in the stratosphere. It plays an important role to protect humans and other life from ultraviolet light. Unfortunately, Chlorofluorocarbons (CFCs) have been released into the atmosphere and have contributed to the depletion of this important protective layer. This will cause humans suffering like skin cancer and UV radiation may kill plankton. CFCs will also cause global warming.

We should take action to protect our ozone layer. We have to ban the use of CFCs products. United State have already signed a treaty to phase out CFC production, known as the Montreal Protocol. Besides, we should always unplug or switch off electronic instruments when they are not in use. We can plant trees as they absorb the UV rays and try to use products which are labeled ‘Ozone-Friendly’.

In conclusion, we should start now to care for and save our earth.

Introduction

Ozone is a gas that occurs naturally in our atmosphere. Most of it is concentrated in the ozone layer, a region located in the stratosphere several miles above the surface of the Earth. Although ozone represents only a small fraction of the gas present in the atmosphere, it plays a vital role by shielding humans and other life from harmful ultraviolet light from the Sun. In fact, a major hole in the ozone layer above the Antarctica skyline now threatens the continent badly. There are plenty of causes and effects of ozone depletion, CFC emission being one.

Findings
Factor of Ozone Depletion

Human activities in the last several decades have produced chemicals, such as chlorofluorocarbons (CFCs). It has been released into the atmosphere and has contributed to the depletion of this important protective layer. In fact, the most important cause which accounts for almost 80% of the total depletion of ozone layer in the stratosphere are CFCs. Beder (unknown) stress the ozone layer is being broken down by chlorine atoms from CFC molecules and bromine atoms from halons. These compounds are very stable in the lower atmosphere of the earth. While in the stratosphere, they break down to release a free chlorine atom due to ultraviolet radiation. A free chlorine atom reacts with an ozone molecule (O3) and forms chlorine monoxide (ClO) and a molecule of oxygen. Now chlorine monoxide reacts with an ozone molecule to form a chlorine atom and two molecules of oxygen. The free chlorine molecule again reacts with ozone to form chlorine monoxide. The process continues and the result is the reduction or depletion of ozone in the stratosphere.

Effect of Ozone Depletion

Therefore, these factors bring a lot of problem on our daily life. For examples, LensMan999 (unknown) stresses that the ozone depletion will lead an increase in the percentage of skin cancer and cataracts. In addition, figure 1 from the reference shows that the UV radiation may damage crops, kill plankton that serve as a food source for marine life. The human immune system also will be affected. CFCs may trap heat and thus contribute to the global warming. As ScienceDaily (2011) shows ozone hole linked to climate change all the way to the equator.

Solution on Ozone Layer Depletion

September 16 was voted the world ozone day in the year 1994 by the United Nations General Assembly. This proves ozone depletion is a big issue that needs attention. Hence, we should be aware and actions must be taken to ensure that ozone layer is not destroyed.

Firstly, we have to ban the use of CFCs product as it contains a lot of ozone depleting substances (ODS). But it is difficult...
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