Ozone Depletion

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Essay
ozone depletion is a serious problem presently facing the world. The ozone layer protects humans, animals, and plants from harmful ultraviolet rays. Money and time are being spent on ozone repair, but the problem still exists.

The ozone layer is a region of the stratosphere containing ozone, or O3 gas. The ozone layer is necessary to both plant and animal life on earth because it protects the surface from dangerous ultraviolet light.

However, manufacturing and household chemicals that are currently in use have been found to destroy ozone, and the problem has worsened to an ozone layer "hole" above Antarctica. Ozone levels there are 40 percent below normal, and there may be another ozone hole forming above the Arctic region.1

Ozone gas contains an extraneous oxygen atom in each molecule and is highly unstable. This property lets ozone block out ultraviolet rays and makes it an essential part of the eco-system. When harmful ultraviolet-B rays (wavelength 240-320 NM) come through the atmosphere, the O3 molecules absorb the energy and one oxygen atom removes from the molecule. The stray atom will eventually collide with another O2 molecule and ozone will be reformed. With this process, the level of ozone remains constant, as it has for millions of years.3

Recently, a number of chemicals have been found to aid in the rapid destruction of ozone. Most of these chemicals are compounds called chlorofluorocarbons, or CFC's. It is difficult to ban them outright because they have hundreds of industrial uses. CFC's are widely used because they are non-toxic, non-flammable, and inexpensive. Recent environmental legislation on both the state and national levels has banned the use of some CFC's, but the question of their disposal still remains.4

Chlorofluorocarbons do not destroy ozone directly. Compounds made from CFC's photo-decay series act as catalysts in the breaking up of O3 molecules. When CFC's reach the stratosphere, they break down when...
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