Ozone Depletion And Global Warming Essay Title

The Effects of Ozone Depletion Essay

1265 Words6 Pages

The ozone layer is a deep layer in the Earth’s stratosphere that has an altitude of about 6.2 miles and contains a high concentration of ozone molecules. The ozone layer shields the entire Earth from some of the harmful ultraviolet rays that come from the sun. The Earth’s atmosphere is composed of several layers, but the layer that we live in - the “troposphere” – is where most weather occurs. Above the troposphere is the stratosphere which is where most of the effects caused by ozone holes and global warming originate. The ozone layer absorbs 97% to about 99% of the Sun’s medium-frequency ultraviolet light which could otherwise potentially harm and damage exposed life forms on the surface of the Earth. There are three main types of…show more content…

The ozone layer is a deep layer in the Earth’s stratosphere that has an altitude of about 6.2 miles and contains a high concentration of ozone molecules. The ozone layer shields the entire Earth from some of the harmful ultraviolet rays that come from the sun. The Earth’s atmosphere is composed of several layers, but the layer that we live in - the “troposphere” – is where most weather occurs. Above the troposphere is the stratosphere which is where most of the effects caused by ozone holes and global warming originate. The ozone layer absorbs 97% to about 99% of the Sun’s medium-frequency ultraviolet light which could otherwise potentially harm and damage exposed life forms on the surface of the Earth. There are three main types of ultraviolet light which are produced from the Sun: UV-A radiation, UV-B radiation and UV-C radiation. UV-A has a long wavelength of about 315 to 400 nanometers from the sun and is considered a “black light” which is not strongly absorbed by the Earth’s ozone. UV-B has a medium wave length of about 315 to 280 nanometers which is mostly absorbed by the ozone layer. Human exposure to UV-B rays increases the risk of skin cancer, a weakened immune system, and cataracts. Additionally, UV-B exposure can also damage single cell organisms, terrestrial plant life, and aquatic ecosystems. UV-C has a short wave length of 280 to 100 nanometers and is completely absorbed by the ozone layer and the atmosphere. UV-C has a variety of positive uses, but

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Essay on Ozone Depletion and the Environment

1505 Words7 Pages

Ozone Depletion and the Environment

There is overwhelming scientific evidence that man-made chemicals are destroying the ozone layer -- Nobel prizes have already been awarded for the research. Rush Limbaugh argues that humans are safe, because volcanic chlorine has been working on the ozone layer longer than man-made chlorine, and yet we're still here. But this argument is false. Volcanic chlorine is water soluble, and rained harmlessly out of the atmosphere. Human CFCs are insoluble, and can therefore rise to the ozone layer where they can do their damage.

Do man-made chlorofluorocarbons (CFCs) destroy the ozone layer? There are no longer any skeptics left at NASA, the National Academy of Sciences, the National…show more content…

However, man-made CFCs are not water soluble. CFCs are free to rise all the way to the top of the stratosphere, where they break down, releasing their chlorine radicals. The reaction is complex, involving many different chemicals, but the result of these reactions is that the CFC is recreated, allowing it to continue wreaking havoc. Other processes are at work to remove CFCs from the ozone layer, so these reactions really can't continue indefinitely, but scientists expect the CFC's already present to remain there for the next century. In fact, recent measurements show that the level of CFCs is already declining, thanks to international treaties banning their production. (2)

The banning of CFCs is a triumph of both science and international diplomacy. In the early 80s, scientists working in the Antarctic noticed that there was a hole in the ozone layer over the South Pole. Preliminary research pointed to CFCs as the culprit. In October 1987, the world's nations signed the Montreal Protocol, pledging to cut CFC production in half over the next ten years. Subsequent scientific evidence suggested the threat was worse than realized, and the Protocol was strengthened twice - once in London in 1990, and again in Copenhagen in 1992. The Copenhagen agreement moved up the complete ban of CFCs to January 1996. Today, they are completely outlawed, although

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