| 单词 | ozone layer |
| 释义 | ozone layer A layer of the stratosphere protecting the earth's surface from harmful radiation. Depletion of this layer is believed to be due to human activities, the use of chlorofluorocarbons (CFCs), halon and other chemicals releasing chlorine molecules which, with a delay of around a decade, affect the stratosphere. Control of emissions requires global agreement, since each user of CFCs benefits from its own activities while most of the resulting damage affects the world as a whole. An agreement to replace CFCs and halon was reached in 1987 in the Montreal Protocol. |
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