Trade-secret of the success of the Montreal Protocol: Customs in the frontline

The 16th of September last year commemorated the 23rd anniversary of the Montreal Protocol on Substances that Deplete the Ozone Layer. Monitoring the trade in ozone depleting substances (ODS) and their ozone-friendly substitutes has been the hallmark of the implementation of the Montreal Protocol. There is, therefore, much to celebrate as well as many challenges ahead for Customs officers around the world.