CIESIN Reproduced, with permission, from: Tolba, M. K., O. A. El-Kholy, E. El-Hinnawi, M. W. Holdgate, D. F. McMichael, and R. E. Munn, eds. 1992. Ozone depletion. Chapter 2 in The world environment 1972-1992. New York: Chapman and Hall.

Key Findings of the Scientific Assessment of Stratospheric Ozone: 1989

Remarkable progress has been made in stratospheric ozone science in the past few years. There have been highly significant advances in the understanding of the impact of human activities on the Earth's protective ozone layer. Since the Montreal Protocol was signed. there have been four major findings, each of which has heightened concern that chlorine- and bromine-containing chemicals can lead to a significant depletion of stratospheric ozone.