3 ms·

I'd say you're probably right, but then things like the hole in, or the thickness of, the ozone layer would make a difference between pre- and post-industrial s

I'd say you're probably right, but then things like the hole in, or the thickness of, the ozone layer would make a difference between pre- and post-industrial sun exposure.

JKCalhoun 4y ago
My Apple Watch needs a UV sensor that accumulates UV exposure levels and can tell me when it's time to come inside.
- shepherdjerred 4y ago
  That would actually be pretty cool