The Montreal Protocol on Substances that Deplete the Ozone Layer has been successful in meeting its goals in phasing out Ozone Depleting Substances (ODSs). As a result, the abundance of ODSs in the atmosphere is declining and the ozone layer is expected to recover around the middle of this century.
The negative aspect of the success is that it has become increasingly difficult to get the attention of, or funding from, policy makers to deal with the remaining challenges of the ozone layer protection. This document attempts to put into perspective the successes and the remaining challenges. MORE