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Why the ozone layer’s healing should be a cause for celebration

Nick March
24 Jan 2023 00:00:00 | Update: 23 Jan 2023 23:57:22
Why the ozone layer’s healing should be a cause for celebration

There must be something about the human condition that even when good news arrives, we are almost unwilling to enjoy it. How else would you explain the relatively muted global response to the UN announcement this month that the hole in the ozone layer, a serious environmental concern for several decades, is shrinking and will be fully repaired within years?

Perhaps it is because this rare piece of demonstrable environmental progress arrived within the context of a daily news cycle often dominated by death, destruction and devastation.

Or it may be, as others will argue, that it is hard to invest too much time or emotion into a situation that may never happen when there are so many pressing threats to everyday life clearly evident in societies, economies and communities. Whatever the case, many people will have simply shrugged and got on with their lives when the UN made its pronouncement on January 9 that the hole in the ozone layer will be healed by 2066.

The repair of the ozone layer is worth marking for several reasons: a catastrophic threat to our existence has been averted and that tells us a lot about international treaties and the power of the collective will. Further, the case study provides broader takeaways for staying the course, as well as reflections on the power of research.

Scientists Mario Molina and Sherwood Rowland first noted that chlorofluorocarbons or CFC gasses – which in the 1970s were typically found in hairspray and in the cooling mechanisms of refrigerators – posed a significant threat to the ozone layer.

Their work helped create the conditions for the concerted international action that resulted in the Montreal Protocol, a transformative 1980s treaty to significantly reduce the release of ozone-depleting substances.

Its introduction was the result of years of action, beginning with the original Vienna Convention monitoring ozone depletion, signed at the height of the Cold War in the mid-1980s.

The subsequent Montreal Protocol, which phased out the production of ozone-depleting substances, would go on to be ratified by all UN members and later offered solidarity support from richer nations to less developed countries to help meet international compliance, a further example of progressive international policymaking. Years later, Molina and Rowland won the Nobel Prize for Chemistry for their work, along with Paul Crutzen, who had earlier made important ground on the effects of nitrogen oxide emissions upon ozone reduction.

Little wonder that the protocol was described by the late Kofi Annan as the “most successful environmental treaty ever”, while then US president Ronald Reagan called it a “monumental achievement” at the time of its introduction 34 years ago on January 1, 1989.

If the protocol is an exercise in global co-operation and scientific endeavour working in symphony, it also provided an example of staying the course even against a backdrop of setbacks and challenges. The largest hole in the Antarctic ozone layer wasn’t recorded until 2006, according to AFP, and it would be another decade before scientists could confirm, in 2016, that the hole was shrinking. There was to be no comfortable straight line between discovery, action and resolution. Sceptics argue that there are few parallels to be drawn between the requirement today for urgent climate action and the successful path charted via the Montreal Protocol.

They say that the evidence of ozone layer depletion was so well defined that it limited the space for obfuscating deniers, who have occasionally risen to prominence in the climate space in more recent times, thus making it easier to take action back then and forge that collective will for change.

Pessimists (they may prefer the term realists) say that finding solutions to current climate issues will be far harder than gathering the momentum that led to the Montreal Protocol, in essence because multiple levers will have to be pulled to make genuine progress. In addition, the here-and-now of conflict and crisis often presents far greater problems than the need for change at some distant point in the future.

The National