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Encyclopedia > Depletion

Depletion is the process of running down or reducing the total resource available. This usually involves conversion into another form with a resultant release of energy - see the Laws of thermodynamics.


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Ozone depletion - Wikipedia, the free encyclopedia (4108 words)
Prior to the beginning of the depletion trend, the amount of ozone in the stratosphere was kept even by a stable balance in the amount of creation and destruction of ozone molecules by UV light.
The role of sunlight in ozone depletion is the reason why the Antarctic ozone depletion is greatest during spring; during winter, even though PSCs are at their most abundant, there is no light over the pole to drive the chemical reactions.
Any measures against ozone depletion which have a negative economic impact will remain a controversial issue due to the strong economic interests involved, with key questions regarding whether the scientific understanding is strong enough to warrant the proposed countermeasures.
Ozone depletion - definition of Ozone depletion in Encyclopedia (2586 words)
In public policy discussions, the term ozone layer depletion is considered synonymous with the theory that a trend of global ozone depletion, which is mainly caused by CFC emissions, is subsequently allowing more ultraviolet radiation to reach the earth's surface.
Since the ozone layer absorbs ultraviolet light from the Sun, ozone layer depletion is expected to increase surface UV levels, which could lead to damage, including increases in skin cancer.
UVB (the higher energy UV radiation absorbed by ozone) is generally accepted to be a contributory factor to malignant melanoma (skin cancer) -- for example one study showed that a 10% increase in the UVB was associated with a 19% increase in melanomas for men and 16% for women (Fears et al, Cancer Res.
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