Pretty sure we stopped using the chemicals that made the hole in the ozone layer… and then it healed by itself.

...Which required legislative efforts right?

Like, we didn't just all decide to stop. We identified the issues, and made steps towards stopping it.

If there was no bans they'd still use it.

Yeah that was what I meant! It wasn’t a miracle that happened all by itself. It proves exactly that opposite that humans did it though massive cooperation after listening to scientists.

Correct, none of these problems solved themselves. They have been addressed only through huge concerted efforts.