Ozone

Sheldon Ungar

Atmospheric ozone (O 3 ) is found mostly between about 9 and 23 miles above the Earth's surface in a region called the stratosphere. This ozone layer acts as a barrier protecting life on Earth from harmful ultraviolet (UV) radiation from the sun. From 1970 on, scientists expressed concern that human-made chemicals, particularly chlorofluorocarbons (CFCs), were thinning the ozone layer. A 1976 report by the U.S. National Academy of Sciences (NAS) concluded that the ozone depletion hypothesis was supported by scientific observations. Calculations suggested a global ozone loss of 5 to 7 percent by 1995, with attendant increases in skin cancer, probable damage to human and animal As ...

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