Many HN users might be too young to remember, but curiously enough a/c refrigerants were also a major issue the last time there was a successful international t

Many HN users might be too young to remember, but curiously enough a/c refrigerants were also a major issue the last time there was a successful international treaty to help fight a major environmental problem: https://en.wikipedia.org/wiki/Montreal_Protocol https://en.wikipedia.org/wiki/Montreal_Protocol > It was agreed on 16 September 1987, and entered into force on 1 January 1989... As a result of the international agreement, the ozone hole in Antarctica is slowly recovering.[3] Climate projections indicate that the ozone layer will return to 1980 levels between 2050 and 2070.[4][5] Due to its widespread adoption and implementation it has been hailed as an example of exceptional international co-operation, with Kofi Annan quoted as saying that "perhaps the single most successful international agreement to date has been the Montreal Protocol".