The Montreal Protocol (MP) is the only climate change treaty that has been ratified by every country in the globe and is testament to the fact that nations can achieve complete unanimity in fighting climate change.

In a function held to celebrate 25 years of MP organised by the ministry of environment and forests, New York-based Dr Suely Carvalho, chief of the Montreal Protocol, pointed out that parties to the protocol have phased out 98 per cent of ozone-depleting chemicals.