Number 5 (Story #3), October 18, 1990 by Phillip F. Schewe and Ben Stein THE OZONE HOLE OVER ANTARCTICA has reopened and is nearly as bad as in the worst years of 1987 and 1989. The depletion of stratospheric ozone, caused by man-made chlorofluorocarbons, allows more solar ultraviolet radiation to reach the earth's surface. (The New York Times, October 12, 1990.)