The key takeaway is that there have now occasionally been situations in places where humans cannot survive at all outdoors, even if they are optimally healthy

The key takeaway is that there have now occasionally been situations in places where humans cannot survive at all outdoors, even if they are optimally healthy and hydrated. That is to say: situations where the environment is no longer livable. This is an interesting piece of anecdata.[1] Of course there is other anecdata for any and every other set of permutations, but mentioning all of that every time is a bit silly. [1] Since anecdata is a neologism to begin with, I presume that attempting to insist on "anecdatum" is probably a lost cause. :-/