@johnzajac @__Styx__ have you or anyone else you know done a study on what happens to terrestrial plants when they're hit with a 100% incoming UVB (as in pre-ozone-layer) level? I have not found an answer to that question and what I found for lower UVB exposure levels was inconclusive

@__Styx__ @johnzajac while not detracting from your larger point: the research I was looking at was examining _existing_ African cultivars of rice and looking at what can be done to other ones to make them more UVB-resistant. so in this particular case the adaptations were already there

@__Styx__ @johnzajac i would be much happier if that page provided citations for the impact on even the (better-studied) terrestrial plants, but my own search turned up a range of conclusions from "the plants we studied are unaffected but we don't know if it generalizes" to "this will require certain cultivars", so i assume they can't. i do agree though that the result will be somewhere in between the two extreme cases you listed

@geos @__Styx__ @johnzajac no, i just see civilizations as pretty resilient (especially if the countermeasures are well understood and easy to manufacture)

@__Styx__ @johnzajac what civilization ending event? with no ozone layer at all we'd have to deal with significantly more skin cancer and cataracts. an issue but not at that scale