> The ozone hole was huge, then it turns out it’s patched. You make it sound like the ozon layer problem was not a big deal, and went away on its own. It was

> The ozone hole was huge, then it turns out it’s patched. You make it sound like the ozon layer problem was not a big deal, and went away on its own. It was actually fixed with the Montreal protocol[1]. So this is an example of a problem that urgently needed international cooperation to solve, and was indeed solved that way. (The ozon layer is still slowly recovering btw. The hole is still there. But the problem peaked in the year 2000.) [1] https://en.wikipedia.org/wiki/Montreal_Protocol https://en.wikipedia.org/wiki/Montreal_Protocol