Environmental Sciences Fair Project
Fossil and alternative fuels effect on the ozone layer

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Project Information
Title: Fossil and alternative fuels effect on the ozone layer
Subject: Environmental Sciences
Grade level: Middle School - Grades 7-9
Academic Level: Ordinary
Project Type: Descriptive
Cost: Low
Awards: 1st place, Canada Wide Virtual Science Fair (2003)
Affiliation: Canada Wide Virtual Science Fair
Year: 2003
Description: Main topics: Kyoto Accord, effects of fossil fuel on ozone layer depletion and global warming (Remark: the connection between fossil fuels and ozone depletion, and ozone depletion and global warming is not strong - the editor).
Link: www.odec.ca...

Ozone Depletion

Ozone depletion describes two distinct, but related observations: a slow, steady decline of about 4% per decade in the total volume of ozone in Earth's stratosphere (ozone layer) since the late 1970s, and a much larger, but seasonal, decrease in stratospheric ozone over Earth's polar regions during the same period. The latter phenomenon is commonly referred to as the ozone hole. In addition to this well-known stratospheric ozone depletion, there are also tropospheric ozone depletion events, which occur near the surface in polar regions during spring.

The detailed mechanism by which the polar ozone holes form is different from that for the mid-latitude thinning, but the most important process in both trends is catalytic destruction of ozone by atomic chlorine and bromine. The main source of these halogen atoms in the stratosphere is photodissociation of chlorofluorocarbon (CFC) compounds, commonly called freons, and of bromofluorocarbon compounds known as halons. These compounds are transported into the stratosphere after being emitted at the surface. Both ozone depletion mechanisms strengthened as emissions of CFCs and halons increased.

CFCs and other contributory substances are commonly referred to as ozone-depleting substances (ODS). Since the ozone layer prevents most harmful UVB wavelengths (270315 nm) of ultraviolet light (UV light) from passing through the Earth's atmosphere, observed and projected decreases in ozone have generated worldwide concern leading to adoption of the Montreal Protocol banning the production of CFCs and halons as well as related ozone depleting chemicals such as carbon tetrachloride and trichloroethane. It is suspected that a variety of biological consequences such as increases in skin cancer, damage to plants, and reduction of plankton populations in the ocean's photic zone may result from the increased UV exposure due to ozone depletion.

For more information (background, pictures, experiments and references): Ozone Depletion

Source: Wikipedia (All text is available under the terms of the Creative Commons Attribution-ShareAlike License)

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