That was a significant risk at one point.

> When that didn't happen, we would all suffocate because all the forests would die due to acidrain.

Eh? Who told you that?

> Then we would all die of skin cancer due to the ozone-hole.

That was a serious, but ultimately very tractable problem, with an expensive but feasible solution, which was taken.

> I actually remember the nuclear effects from Tjernobyl, glad I didn't die then.

See answer two.

Global warming is most similar to number three, but the solutions are far, far more expensive, and may have been left too late.

Ultimately "something bad nearly happened, but it was averted" doesn't form a great basis to assume that the next very bad thing will also be averted.