Emitted gas molecules with atmospheric lifetimes greater than a few years circulate between the troposphere Cfcs detroy the ozone essay stratosphere multiple times, on average, before conversion occurs.
The reservoir gases hydrochloric acid and chlorine nitrate react with each other on the surface of the PSC particles through a red-ox reaction and liberate elementary chlorine Cl2.
Their warnings led to a ban of CFC aerosols in this country in Destruction of these phytoplanktons would give serious problems to fishes which depend on these small creatures for food, and eventually effect humans.
Table 1 lists the most common CFC and halon compounds, along with their relative ozone-depletion effects, quantities produced, and uses.
The accumulation occurs because most source gases are highly unreactive in the lower atmosphere. That is, as one rises in altitude the air cools until a point is reached where the stratosphere begins and the air begins to warm from this heat absorption.
The chief ozone-depleting substances include chlorofluorocarbons CFCscarbon tetrachloride, hydrochlorofluorocarbons HCFCs and methyl chloroform. It is simply not a depletable resource like a fossil fuel.
However Rowland and Molina did a marvelous job of defending their results and explaining the significance of these dangerous CFCs to other scientists, government officials, and the press.
Why Ozone Layer is Necessary?
Besides rays from the sun, photon can also come in the Earth and be destructive. Pinatubo in has also contributed towards ozone depletion. A normal oxygen molecule O2 consists of two oxygen atoms, in diatomic form. CFC has been the refrigerant of choice for decades.
The distinction between extruded polystyrene and EPS needs clarification. The stratosphere is the next layer above the troposphere stretching approximately 15 to 60 kilometers. The reaction that causes this is mostly nitrogen dioxide produced in part by high altitude cosmic raysthrough ultraviolet dissociation by the same UV-C that creates ozone, and also by a less energetic band know as UV-B, which is absorbed in the higher regions of the atmosphere.
It was clear that the amount of ozone in the Northern Hemisphere stratosphere fell by 8 percent between andacross a region that covers virtually all of the contiguous Untied States and Europe from the Mediterranean to the south of England.
Surveys show that most of us would even be willing to pay a little more on our electric bills if doing so would help reduce acid rain. Qualified scientists have proven the whole notion of the ozone layer is not something fixed and finite to be destroyed faster and slower rates.
Other than the health threats to humans, UV radiation puts many other living organisms in danger. Ozone is a bad guy at ground level, where high levels present a serious pollution problem in most major cities. With extruded polystyrene, on the other hand, the styrene is mixed with CFC and injected in an extruding machine.
Later the only reasonable conclusion they drew out was that the use of CFCs be banned. Ultraviolet rays are also capable of destroying single cell organism, terrestrial plant life, and aquatic ecosystems. The graph shows the history and near future of annual total emissions of ozone-depleting substances ODSs combined with natural emissions of halogen source gases.
With all the new regulations taking affect and being postponed, nothing was getting accomplished, but finally, on Octoberaerosols where banned in the United States.essay on ozone depletion by human’s actions Words | 7 Pages OZONE DEPLETION BY HUMAN’S ACTIONS The ozone layer is a very important component in the atmosphere.
Man-made CFCs are the main cause of stratospheric ozone depletion. CFCs have a lifetime of about 20 to years, and consequently one free chlorine atom from a CFC molecule can do a lot of damage, destroying ozone molecules for a long time. The deterioration of the ozone layer, caused by Cfcs, endangers the lives of humans'.
Cfcs have a diminishing effect on the ozone layer. Furthermore, the deterioration of the ozone cause an increase of Ultraviolet (UV) radiation which can have a negative effect on human skin and eyes/5(5).
Ozone Depletion. 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/5(1).
would react with the ozone and convert it back into plain oxygen.
The even worse part of all this is that these chlorine molecules do not become inactive after the first reaction with the ozone and would be available to destroy more ozone molecules. In December ofRowland and Molina discovered that CFCs can destroy the ozone in the stratosphere. In Junethe Natural Resources Defence Council (NRDC) sued the Consumers Product Safety Commission for a band of CFCs used in aerosol spray cans.Download