[Nition]

The Montreal Protocol has not been perfectly adhered to either. China started emitting quite a lot of banned CFCs again from around 2012[1], which didn't get noticed until 2018! By 2020 it had finally stopped[2].

[1] https://www.nature.com/articles/s41586-018-0106-2

[2] https://www.nature.com/articles/d41586-021-00360-0