International regulation of Ozone and Climate under the Montreal Protocol
The Montreal Protocol was agreed in 1987 with a pressing mission to regulate the chemicals directly destroying Earth’s ozone layer and is celebrated as the world’s most successful environmental treaty. We were instrumental in proposing and then making the case that the Protocol, which so ably removed chlorofluorocarbons (CFCs), was the best mechanism by which to phase out the harmful hydrofluorocarbons (HFCs) which have come to replace CFCs. This work resulted in the Kigali Amendment on HFCs which came into force in January 2019.