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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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