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Trouble with Chlorofluorocarbons (CFCs) The destruction of the ozone shield is linked to chlorofluorocarbons, or CFCs, one million tons of which are released annually around the world. These chemicals serve as the coolants in our air conditioners and refrigerators, the foaming agents in our styrofoam packaging and insulation, the sterilants used to sanitize our surgical instruments, and the solvents used to clean scores of electrical components. Each of these products releases CFCs into the atmosphere. Once free, the CFCs float up to the ozone layer and remain there for 75 to 100 years, destroying the ozone molecules. Every 1% drop in ozone results in a 2% increase in the intensity of the most harmful type of ultraviolet radiation, UV-B. Scientists predict that, beyond the health risks to humans, a prolonged increase of UV-B rays could set in motion far-reaching and unpredictable ecological changes. There is evidence, for example, that...

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