The size of the hole will fluctuate with the season... and yes, we have seen big 'uns, but this:
The loss of ozone has levelled off. Recovery IS happening. But slowly.
CFCs is bad for them ozones. And we don't exactly CFCs to survive. So it was an easy sacrifice.
We can't stop climate change. Not at all. And even knowing what's causing the warming trend, we can't stop that, either. Not even if we dedicated our entire economic output to sequestering carbon.
But we can mitigate the change. Even if only by a bit.
Even more importantly, we can prepare ourselves for the aftereffects.