Are you serious? It "just went away?" CFCs were identified as the driving force, and the Montreal Protocol was ratified by nearly all nations in 1987, banning nearly all uses of CFC. And nations actually put it into effect; it wasn't just a paper agreement. It took decades but natural processes went back closer to its old equilibrium.

It didn't just go away GDI. We figured out what the problem was and fixed it. You've heard of science before?

Are you just mad that the Montreal Protocol worked?

It "just went away" because governments listened to scientists and took drastic action to fix it.

Eco activists are too alarmed. DO your own research.