With today’s scientific tools, the problem could have been spotted in the 1950s.

Ozone loss was a thing even before CFCs were widely used

With today’s scientific tools, the problem could have been spotted in the 1950s.

Ozone damage could have been detected decades earlier

Why the Arctic’s ozone hole just closed

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You’re probably familiar with the infamous ozone hole over Antarctica, caused by damaging and now-illegal chemicals.

But during March and April this year there was a notable zone of depleted ozone — which protects life from the sun’s ultraviolet radiation — over the Arctic, too. It closed last week, though it wasn’t nearly as robust as the annual Antarctic ozone hole, and it certainly…