Abstract
Human activities deplete stratospheric ozone to a lesser degree than had previously been reported, according to a National Research Council (NRC) committee. The committee updated earlier NRC studies by reviewing recent research on the whether increased chlorofluorocarbons (CFC) and various trace gases would figuratively chip away at the envelope of stratospheric ozone that shields the earth from harmful ultraviolet radiation. The new estimates stem from improved mathematical models and from better measurements fed into the models.Two different types of models were incorporated into the update. One considered only CFC, the other accounted for changes in a variety of trace gases. Both types suggest less change in total stratospheric ozone than had been previously estimated.
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