eli5, how did the ozone layer patch itself?
In: 75
The upper atmosphere is getting hit with a lot of high energy rays from the Sun. These rays hit O2 molecules and O3 molecules, ripping them apart and combining them together again. This is how the ozone layer protects the surface from those rays.
But it also has some equilibrium ratio of ozone:oxygen. So even if it somehow gets disrupted by human activity, then as long as we stop that activity, it will slowly go back to that equilibrium. And because all modern life evolved to live within that equilibrium, that is good.
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