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Despite far less consensus and surety regarding the exact culprit among the scientific community compared to the unity that we have for anthropogenic climate change today, the world’s nations unilaterally came together to draft and enforce a protocol to the Vienna Convention for the Protection of the Ozone Layer, the outcome of a convention held in Montreal which became an international and universal priority on this day in 1987.
Depletion of atmospheric ozone first discovered and researched, with its grave implications limned and communicated during the intervening years, within just a little more than fourteen years public and political will aligned and overcame deniers and those in impacted industries—aerosol and cooling, with a managed phase-out of the most harmful compounds that fostered willing partnerships and commitments for reform. Among the few environmental success stories to hold up as examples of what we can achieve (though we should also be vigilant to avoid losing those gains and there’s unfinished business yet), human change has allowed the ozone layer to repair and replenish itself.