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An animated image showing projections of stratospheric ozone concentrations if chlorofluorocarbons (CFCs) had not been banned. CFCs and other halogenated ozone-depleting substances are mainly responsible for man-made chemical ozone depletion. Since the ozone layer absorbs UVB ultraviolet light, its depletion is expected to increase surface UVB levels, which could lead to damage, including increase in skin cancer.