Abstract

The good news, according to a new report about ozone depletion, is that the ozone layer will recover in 50 years—if parties to the 1987 Montreal Protocol on Substances that Deplete the Ozone Layer fully adhere to the treaty, and if other conditions that could affect the atmosphere remain stable.The “Scientific Assessment of Ozone Depletion: 1998,” a report prepared by the scientific assessment panel of the Montreal Protocol, states, “The stratospheric abundance of halogenated ozone‐depleting substances is expected to return to its pre‐1980 (that is, “unperturbed”) level of 2 ppb chlorine equivalent by about 2050 assuming full compliance with the Montreal Protocol and its Amendments and Adjustments.”

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